Shall we try computing digraphs?
  
  First, ignoring word and line breaks:
  
    --- glp2let ------------------------
    #! /n/gnu/bin/sed -f
    # Maps the most popular glyphs to single letters
    # Discard ordinary blanks:
    s/ //g
    # Map line, paragraph, and word breaks to blanks:
    s@(_)@ @g
    s@(//)@ @g
    s@(=)@ @g
    s/   */ /g
    # Any other garbage goes to "?":
    s/([^)]*[^)a-z][^)]*)/\?/g
    # Now the glyphs:
    s/(qo)/W/g
    s/(o)/Y/g
    s/(t)/T/g
    s/(tc)/D/g
    s/(tcc)/J/g
    s/(s)/S/g
    s/(sc)/Z/g
    s/(scc)/X/g
    s/(b)/A/g
    s/(e)/U/g
    s/(r)/I/g
    s/(z)/O/g
    s/(g)/E/g
    s/(bg)/Æ/g
    s/([dh])/C/g
    s/([dh]c)/G/g
    s/([dh]cc)/Q/g
    s/([dh]z)/F/g
    s/([dh]zc)/V/g
    s/([pf])/@/g
    s/([pf]z)/\#/g
    s/([pf]zc)/\$/g
    s/(qoe)/Ñ/g
    s/(qor)/P/g
    s/(oe)/H/g
    s/(or)/B/g
    s/(ae)/L/g
    s/(am)/M/g
    s/(an)/N/g
    s/(ar)/R/g
    s/(ak)/K/g
    #Anything else is a program error:
    s/([^)]*)/\*/g
    ------------------------------------

    cat .voyn.glp \
      | glp2let \
      | tr -d ' \012' \
      | enum-digraphs \
      | grep -v ' ' \
      | count-transition-freqs \
          -v chars=' ÆEAIOULMNRKHBÑPWYTDJSZXCGQFV@#$?*'

    State entropy: 4.405

    Transition entropy: 4.405

    Transition counts:

        count  freq ntrpy pntpy     Æ     E     A     I     O     U     L     M     N     R     K     H     B     Ñ     P     W     Y     T     D     J     S     Z     X     C     G     Q     F     V     @     #     $     ?
      - ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
      N   495 0.028 3.680 0.104     6    12    28     1    11     4     4     1     1     4     .    79     6     4     .    20    83    38    66    12    15    72    15     1     .     .     3     1     3     1     1     3
      A   685 0.039 3.729 0.145     2     4     3     2     3    16   125    97    56   117    10    61    18     4     .    20    25    14    24     3     8    29     6     4     5     2     .     .     1     .     .    26
      B   286 0.016 3.947 0.064     .    21     9     .     1     1    11    15    10    10     1    49     9     1     .    11    31     8    22     7     3    39    10     6     .     .     .     1     7     .     .     3
      Ñ   193 0.011 4.059 0.045     2     9     1     4     3     3     2     4     1     2     .    11     1     5     .     3    13     5    40     6     4    20    13    14     6    15     .     .     3     .     .     3
      O   365 0.021 3.685 0.076     3    10     1     .     5     2    35    48    34    26     1    90    19     .     .     5    28     5    10     3     3    13     4     8     .     1     1     1     2     .     .     7
      P    17 0.001 3.102 0.003     .     .     .     .     .     1     .     3     2     .     .     2     1     .     .     .     1     1     1     1     .     .     .     .     .     .     .     .     .     .     .     4
      C  1654 0.094 3.334 0.313     2   258     4     1     1    14   263   194   349   161    13    98    25     .     .     .    39    66    66     2    11    45     .     .     .     1     .     .     .     .     .    41
      Q   569 0.032 1.395 0.045   339   192    19     2     4     1     2     .     .     1     .     6     1     .     .     .     1     1     .     .     .     .     .     .     .     .     .     .     .     .     .     .
      Æ  2054 0.117 3.534 0.413    20    37   127    58    74   149     4     2     1     6     .   104    16    94     8   744   203    35    96     7    32    70    10    59    21    12     4     3    34     2     .    22
      D   927 0.053 2.430 0.128   461   206    50     2    14     .    11     .     1     8     1    55    10     .     .     .     5     2     .     .     .     .     .    30     7     1    45     8     4     .     1     5
      E  1726 0.098 3.858 0.378    23    33   151    65    92   174     .     2     .     2     1    93    23    63     6   438   146    32    60    11    24    54    11    98    30    41     1     4    27     1     .    20
      R   405 0.023 3.949 0.091     6    28    11     1     7     3    15     4     6     9     1    68    17     2     .    27    54    17    33     7    11    56     8     1     2     .     1     .     4     1     1     4
      F   238 0.014 1.128 0.015    15   199     1     .     1     .     6     .     1     1     .     2     4     .     .     .     3     1     1     .     .     1     .     .     .     .     .     .     .     .     .     2
      S   212 0.012 3.547 0.043    36    28     5     1     1     5     9     1     2     9     1    26     4     1     .     1     8     1     2     .     .     .     .    11     1     .    41    17     .     .     .     1
      G   622 0.035 1.678 0.059   425   104    31     1     3     1     1     .     1     5     .    20     4     .     .     .     3     6     5     .     6     3     .     .     .     .     .     .     .     .     .     3
      T   400 0.023 3.636 0.083    80    62    16     4     6    13    14     .     1     8     4    31     9     .     .     .     9     1     .     .     2     1     .    17     6     2    78    19     5     5     5     2
      H  1152 0.065 4.279 0.280    35    58    43    10    25    25     6    14     8     4     1    77    41     6     2    58    68    50   139    24    25    99    30   140    61    65     2     1    19     1     .    15
      U   456 0.026 3.995 0.104    12    14    16     7    10     5     5     3     2     4     2    42    19     .     .     9    23    25   105    10    10    52    13    33    12    13     .     .     6     .     .     4
      V    82 0.005 1.389 0.006    28    48     1     .     3     1     .     .     .     .     .     1     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .
      I   186 0.011 4.009 0.042     2    11     1     1     2     2    16    19    12     9     3    27    10     1     .     1    11     3    24     3     3    13     4     2     .     .     .     .     3     .     .     3
      #    15 0.001 2.683 0.002     3     5     2     .     .     .     1     .     .     1     .     1     .     .     .     .     1     .     .     .     .     .     .     .     .     .     .     .     .     .     .     1
      J   126 0.007 2.458 0.018    33    55     2     1     7     .     2     1     .     1     .     2     2     .     .     .     .     .     .     .     .     .     .    14     2     .     .     1     1     .     .     2
      W  1436 0.082 1.857 0.152     4     1     6     1     .     1     1     1     .     1     .     4     1     .     .     4     2     2     2     .     .     1     1   754   300   301     2     7    28     .     .    11
      $    10 0.001 0.971 0.001     4     6     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .
      X   150 0.009 2.372 0.020    57    51     5     2     5     .     1     .     .     .     .     4     .     1     .     .     .     .     .     .     .     .     .    17     2     1     1     1     2     .     .     .
      K    43 0.002 2.937 0.007     .     3     8     .    12     .     .     .     .     .     .     1     .     .     1     7     5     .     2     .     .     2     .     .     .     .     .     .     1     .     .     1
      L   557 0.032 4.145 0.131    28    46    61     7    32    16     3     2     2     2     1    42    19     9     .    45    28    28    62     9    19    56     7    12     6     2     1     .     7     .     .     5
      ?   291 0.017 4.161 0.069    51    39    11    13    16    15     2     .     4     3     2    15     3     .     .    12    18     2    11     5     2    13     4    12     1     2     6     3     8     .     1    17
      Y   885 0.050 2.696 0.136    14    18    16     1     9     1     1     .     .     .     .     2     1     1     .     9     3     .     5     1     2     6     1   386   155   109     8     6    53     1     1    75
      M   414 0.024 3.700 0.087     6    12    21     1    15     3     2     .     .     2     .    55     5     1     .    22    61    30    65    12    22    56    11     4     .     .     2     .     3     1     .     2
      Z   716 0.041 2.438 0.099   357   149    33     .     3     .     8     .     .     5     1    43    13     .     .     .     5     .     .     .     .     .     .    31     5     1    42     9     5     2     .     4
      @   227 0.013 2.978 0.038     1     7     2     .     .     .     7     3     1     4     .    41     5     .     .     .     8    27    86     3    10    15     2     .     .     .     .     .     .     .     .     5
        ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
    TOT 17594 1.000 3.198 3.198  2055  1726   685   186   365   456   557   414   495   405    43  1152   286   193    17  1436   885   400   927   126   212   716   150  1654   622   569   238    82   226    15    10   291

    Transition probabilities (× 99):

        count  freq ntrpy pntpy  Æ  E  A  I  O  U  L  M  N  R  K  H  B  Ñ  P  W  Y  T  D  J  S  Z  X  C  G  Q  F  V  @  #  $  ?
      - ----- ----- ----- ----- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
      P    17 0.001 3.102 0.003  .  .  .  .  .  6  . 17 12  .  . 12  6  .  .  .  6  6  6  6  .  .  .  .  .  .  .  .  .  .  . 23

      A   685 0.039 3.729 0.145  .  1  .  .  .  2 18 14  8 17  1  9  3  1  .  3  4  2  3  .  1  4  1  1  1  .  .  .  .  .  .  4

      C  1654 0.094 3.334 0.313  . 15  .  .  .  1 16 12 21 10  1  6  1  .  .  .  2  4  4  .  1  3  .  .  .  .  .  .  .  .  .  2

      F   238 0.014 1.128 0.015  6 83  .  .  .  .  2  .  .  .  .  1  2  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1

      $    10 0.001 0.971 0.001 40 59  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
      #    15 0.001 2.683 0.002 20 33 13  .  .  .  7  .  .  7  .  7  .  .  .  .  7  .  .  .  .  .  .  .  .  .  .  .  .  .  .  7

      G   622 0.035 1.678 0.059 68 17  5  .  .  .  .  .  .  1  .  3  1  .  .  .  .  1  1  .  1  .  .  .  .  .  .  .  .  .  .  .
      Q   569 0.032 1.395 0.045 59 33  3  .  1  .  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

      T   400 0.023 3.636 0.083 20 15  4  1  1  3  3  .  .  2  1  8  2  .  .  .  2  .  .  .  .  .  .  4  1  . 19  5  1  1  1  .
      S   212 0.012 3.547 0.043 17 13  2  .  .  2  4  .  1  4  . 12  2  .  .  .  4  .  1  .  .  .  .  5  .  . 19  8  .  .  .  .

      D   927 0.053 2.430 0.128 49 22  5  .  1  .  1  .  .  1  .  6  1  .  .  .  1  .  .  .  .  .  .  3  1  .  5  1  .  .  .  1
      Z   716 0.041 2.438 0.099 49 21  5  .  .  .  1  .  .  1  .  6  2  .  .  .  1  .  .  .  .  .  .  4  1  .  6  1  1  .  .  1

      J   126 0.007 2.458 0.018 26 43  2  1  6  .  2  1  .  1  .  2  2  .  .  .  .  .  .  .  .  .  . 11  2  .  .  1  1  .  .  2
      X   150 0.009 2.372 0.020 38 34  3  1  3  .  1  .  .  .  .  3  .  1  .  .  .  .  .  .  .  .  . 11  1  1  1  1  1  .  .  .

      V    82 0.005 1.389 0.006 34 58  1  .  4  1  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

      @   227 0.013 2.978 0.038  .  3  1  .  .  .  3  1  .  2  . 18  2  .  .  .  3 12 38  1  4  7  1  .  .  .  .  .  .  .  .  2

      O   365 0.021 3.685 0.076  1  3  .  .  1  1  9 13  9  7  . 24  5  .  .  1  8  1  3  1  1  4  1  2  .  .  .  .  1  .  .  2

      B   286 0.016 3.947 0.064  .  7  3  .  .  .  4  5  3  3  . 17  3  .  .  4 11  3  8  2  1 13  3  2  .  .  .  .  2  .  .  1
      N   495 0.028 3.680 0.104  1  2  6  .  2  1  1  .  .  1  . 16  1  1  .  4 17  8 13  2  3 14  3  .  .  .  1  .  1  .  .  1
      R   405 0.023 3.949 0.091  1  7  3  .  2  1  4  1  1  2  . 17  4  .  .  7 13  4  8  2  3 14  2  .  .  .  .  .  1  .  .  1
      M   414 0.024 3.700 0.087  1  3  5  .  4  1  .  .  .  .  . 13  1  .  .  5 15  7 16  3  5 13  3  1  .  .  .  .  1  .  .  .

      I   186 0.011 4.009 0.042  1  6  1  1  1  1  9 10  6  5  2 14  5  1  .  1  6  2 13  2  2  7  2  1  .  .  .  .  2  .  .  2

      H  1152 0.065 4.279 0.280  3  5  4  1  2  2  1  1  1  .  .  7  4  1  .  5  6  4 12  2  2  9  3 12  5  6  .  .  2  .  .  1
      U   456 0.026 3.995 0.104  3  3  3  2  2  1  1  1  .  1  .  9  4  .  .  2  5  5 23  2  2 11  3  7  3  3  .  .  1  .  .  1
      L   557 0.032 4.145 0.131  5  8 11  1  6  3  1  .  .  .  .  7  3  2  .  8  5  5 11  2  3 10  1  2  1  .  .  .  1  .  .  1
      Ñ   193 0.011 4.059 0.045  1  5  1  2  2  2  1  2  1  1  .  6  1  3  .  2  7  3 21  3  2 10  7  7  3  8  .  .  2  .  .  2

      Æ  2054 0.117 3.534 0.413  1  2  6  3  4  7  .  .  .  .  .  5  1  5  . 36 10  2  5  .  2  3  .  3  1  1  .  .  2  .  .  1
      E  1726 0.098 3.858 0.378  1  2  9  4  5 10  .  .  .  .  .  5  1  4  . 25  8  2  3  1  1  3  1  6  2  2  .  .  2  .  .  1

      K    43 0.002 2.937 0.007  .  7 18  . 28  .  .  .  .  .  .  2  .  .  2 16 12  .  5  .  .  5  .  .  .  .  .  .  2  .  .  2

      W  1436 0.082 1.857 0.152  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 52 21 21  .  .  2  .  .  1
      Y   885 0.050 2.696 0.136  2  2  2  .  1  .  .  .  .  .  .  .  .  .  .  1  .  .  1  .  .  1  . 43 17 12  1  1  6  .  .  8

      ?   291 0.017 4.161 0.069 17 13  4  4  5  5  1  .  1  1  1  5  1  .  .  4  6  1  4  2  1  4  1  4  .  1  2  1  3  .  .  6
        ----- ----- ----- ----- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    TOT 17594 1.000 3.198 3.198 12 10  4  1  2  3  3  2  3  2  0  6  2  1  0  8  5  2  5  1  1  4  1  9  3  3  1  0  1  0  0  2

  Note that C=([dh]) on the right is very different from G=([dh]c) and Q=([dh]cc), which are more similar to 
  Z=(sc), D=(tc), X=(scc), and J=(tcc); and the latter are different from S=(s) and T=(t).  The difference
  has to do with the forward distribution of Æ=(bg), which does not occur after C at all; and also LMNRK,
  which do not occur after G and Q at all.  Also, F=([dh]z) is common after (s) and (t) but less so 
  after Z,D,X,J.  
  
  Thus perhaps we should join CGQSTDZXJ$# with the following letters.
  
  Reverse transition probabilities.  Note that these tables are transposed relative
  to the ones I have created before: the row is the SECOND letter, the column is the FIRST letter.

    cat .voyn.glp \
      | glp2let \
      | tr -d ' \012' \
      | enum-digraphs \
      | grep -v ' ' \
      | revbytes \
      | count-transition-freqs \
          -v chars=' ÆEAIOULMNRKHBÑPWYTDJSZXCGQFV@#$?*'

    State entropy: 4.405

    Transition entropy: 4.405

    Transition counts:

        count  freq ntrpy pntpy     Æ     E     A     I     O     U     L     M     N     R     K     H     B     Ñ     P     W     Y     T     D     J     S     Z     X     C     G     Q     F     V     @     #     $     ?
      - ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
      N   495 0.028 1.723 0.048     1     .    56    12    34     2     2     .     1     6     .     8    10     1     2     .     .     1     1     .     2     .     .   349     1     .     1     .     1     .     .     4
      A   685 0.039 3.780 0.147   127   151     3     1     1    16    61    21    28    11     8    43     9     1     .     6    16    16    50     2     5    33     5     4    31    19     1     1     2     2     .    11
      B   286 0.016 4.203 0.068    16    23    18    10    19    19    19     5     6    17     .    41     9     1     1     1     1     9    10     2     4    13     .    25     4     1     4     .     5     .     .     3
      Ñ   193 0.011 2.067 0.023    94    63     4     1     .     .     9     1     4     2     .     6     1     5     .     .     1     .     .     .     1     .     1     .     .     .     .     .     .     .     .     .
      O   365 0.021 3.673 0.076    74    92     3     2     5    10    32    15    11     7    12    25     1     3     .     .     9     6    14     7     1     3     5     1     3     4     1     3     .     .     .    16
      P    17 0.001 1.646 0.002     8     6     .     .     .     .     .     .     .     .     1     2     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .
      C  1654 0.094 2.583 0.243    59    98     4     2     8    33    12     4     1     1     .   140     6    14     .   754   386    17    30    14    11    31    17     .     .     .     .     .     .     .     .    12
      Q   569 0.032 2.149 0.069    12    41     2     .     1    13     2     .     .     .     .    65     .    15     .   301   109     2     1     .     .     1     1     1     .     .     .     .     .     .     .     2
      Æ  2055 0.117 3.209 0.375    20    23     2     2     3    12    28     6     6     6     .    35     .     2     .     4    14    80   461    33    36   357    57     2   425   339    15    28     1     3     4    51
      D   927 0.053 3.826 0.202    96    60    24    24    10   105    62    65    66    33     2   139    22    40     1     2     5     .     .     .     2     .     .    66     5     .     1     .    86     .     .    11
      E  1726 0.098 4.069 0.399    37    33     4    11    10    14    46    12    12    28     3    58    21     9     .     1    18    62   206    55    28   149    51   258   104   192   199    48     7     5     6    39
      R   405 0.023 2.843 0.065     6     2   117     9    26     4     2     2     4     9     .     4    10     2     .     1     .     8     8     1     9     5     .   161     5     1     1     .     4     1     .     3
      F   238 0.014 2.677 0.036     4     1     .     .     1     .     1     2     3     1     .     2     .     .     .     2     8    78    45     .    41    42     1     .     .     .     .     .     .     .     .     6
      S   212 0.012 3.795 0.046    32    24     8     3     3    10    19    22    15    11     .    25     3     4     .     .     2     2     .     .     .     .     .    11     6     .     .     .    10     .     .     2
      G   622 0.035 2.310 0.082    21    30     5     .     .    12     6     .     .     2     .    61     .     6     .   300   155     6     7     2     1     5     2     .     .     .     .     .     .     .     .     1
      T   400 0.023 3.787 0.086    35    32    14     3     5    25    28    30    38    17     .    50     8     5     1     2     .     1     2     .     1     .     .    66     6     1     1     .    27     .     .     2
      H  1152 0.065 4.321 0.283   104    93    61    27    90    42    42    55    79    68     1    77    49    11     2     4     2    31    55     2    26    43     4    98    20     6     2     1    41     1     .    15
      U   456 0.026 2.639 0.068   149   174    16     2     2     5    16     3     4     3     .    25     1     3     1     1     1    13     .     .     5     .     .    14     1     1     .     1     .     .     .    15
      V    82 0.005 3.243 0.015     3     4     .     .     1     .     .     .     1     .     .     1     1     .     .     7     6    19     8     1    17     9     1     .     .     .     .     .     .     .     .     3
      I   186 0.011 2.830 0.030    58    65     2     1     .     7     7     1     1     1     .    10     .     4     .     1     1     4     2     1     1     .     2     1     1     2     .     .     .     .     .    13
      #    15 0.001 2.866 0.002     2     1     .     .     .     .     .     1     1     1     .     1     .     .     .     .     1     5     .     .     .     2     .     .     .     .     .     .     .     .     .     .
      J   126 0.007 3.779 0.027     7    11     3     3     3    10     9    12    12     7     .    24     7     6     1     .     1     .     .     .     .     .     .     2     .     .     .     .     3     .     .     5
      W  1436 0.082 2.055 0.168   744   438    20     1     5     9    45    22    20    27     7    58    11     3     .     4     9     .     .     .     1     .     .     .     .     .     .     .     .     .     .    12
      $    10 0.001 2.161 0.001     .     .     .     .     .     .     .     .     1     1     .     .     .     .     .     .     1     5     1     .     .     .     .     .     .     .     .     .     .     .     .     1
      X   150 0.009 3.697 0.032    10    11     6     4     4    13     7    11    15     8     .    30    10    13     .     1     1     .     .     .     .     .     .     .     .     .     .     .     2     .     .     4
      K    43 0.002 3.145 0.008     .     1    10     3     1     2     1     .     .     1     .     1     1     .     .     .     .     4     1     .     1     1     .    13     .     .     .     .     .     .     .     2
      L   557 0.032 2.726 0.086     4     .   125    16    35     5     3     2     4    15     .     6    11     2     .     1     1    14    11     2     9     8     1   263     1     2     6     .     7     1     .     2
      ?   291 0.017 3.793 0.063    22    20    26     3     7     4     5     2     3     4     1    15     3     3     4    11    75     2     5     2     1     4     .    41     3     .     2     .     5     1     .    17
      Y   885 0.050 3.734 0.188   203   146    25    11    28    23    28    61    83    54     5    68    31    13     1     2     3     9     5     .     8     5     .    39     3     1     3     .     8     1     .    18
      M   414 0.024 2.385 0.056     2     2    97    19    48     3     2     .     1     4     .    14    15     4     3     1     .     .     .     1     1     .     .   194     .     .     .     .     3     .     .     .
      @   226 0.013 3.567 0.046    34    27     1     3     2     6     7     3     3     4     1    19     7     3     .    28    53     5     4     1     .     5     2     .     .     .     .     .     .     .     .     8
      Z   716 0.041 3.872 0.158    70    54    29    13    13    52    56    56    72    56     2    99    39    20     .     1     6     1     .     .     .     .     .    45     3     .     1     .    15     .     .    13
        ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
    TOT 17594 1.000 3.198 3.198  2054  1726   685   186   365   456   557   414   495   405    43  1152   286   193    17  1436   885   400   927   126   212   716   150  1654   622   569   238    82   227    15    10   291

    Transition probabilities (× 99):

        count  freq ntrpy pntpy  Æ  E  A  I  O  U  L  M  N  R  K  H  B  Ñ  P  W  Y  T  D  J  S  Z  X  C  G  Q  F  V  @  #  $  ?
      - ----- ----- ----- ----- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
      C  1654 0.094 2.583 0.243  4  6  .  .  .  2  1  .  .  .  .  8  .  1  . 45 23  1  2  1  1  2  1  .  .  .  .  .  .  .  .  1
      Q   569 0.032 2.149 0.069  2  7  .  .  .  2  .  .  .  .  . 11  .  3  . 52 19  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
      G   622 0.035 2.310 0.082  3  5  1  .  .  2  1  .  .  .  . 10  .  1  . 48 25  1  1  .  .  1  .  .  .  .  .  .  .  .  .  .

      @   226 0.013 3.567 0.046 15 12  .  1  1  3  3  1  1  2  .  8  3  1  . 12 23  2  2  .  .  2  1  .  .  .  .  .  .  .  .  4

      N   495 0.028 1.723 0.048  .  . 11  2  7  .  .  .  .  1  .  2  2  .  .  .  .  .  .  .  .  .  . 70  .  .  .  .  .  .  .  1
      M   414 0.024 2.385 0.056  .  . 23  5 11  1  .  .  .  1  .  3  4  1  1  .  .  .  .  .  .  .  . 46  .  .  .  .  1  .  .  .

      K    43 0.002 3.145 0.008  .  2 23  7  2  5  2  .  .  2  .  2  2  .  .  .  .  9  2  .  2  2  . 30  .  .  .  .  .  .  .  5
      L   557 0.032 2.726 0.086  1  . 22  3  6  1  1  .  1  3  .  1  2  .  .  .  .  2  2  .  2  1  . 47  .  .  1  .  1  .  .  .
      R   405 0.023 2.843 0.065  1  . 29  2  6  1  .  .  1  2  .  1  2  .  .  .  .  2  2  .  2  1  . 39  1  .  .  .  1  .  .  1

      #    15 0.001 2.866 0.002 13  7  .  .  .  .  .  7  7  7  .  7  .  .  .  .  7 33  .  .  . 13  .  .  .  .  .  .  .  .  .  .
      $    10 0.001 2.161 0.001  .  .  .  .  .  .  .  . 10 10  .  .  .  .  .  . 10 50 10  .  .  .  .  .  .  .  .  .  .  .  . 10

      F   238 0.014 2.677 0.036  2  .  .  .  .  .  .  1  1  .  .  1  .  .  .  1  3 32 19  . 17 17  .  .  .  .  .  .  .  .  .  2
      V    82 0.005 3.243 0.015  4  5  .  .  1  .  .  .  1  .  .  1  1  .  .  8  7 23 10  1 21 11  1  .  .  .  .  .  .  .  .  4

      Æ  2055 0.117 3.209 0.375  1  1  .  .  .  1  1  .  .  .  .  2  .  .  .  .  1  4 22  2  2 17  3  . 20 16  1  1  .  .  .  2
      E  1726 0.098 4.069 0.399  2  2  .  1  1  1  3  1  1  2  .  3  1  1  .  .  1  4 12  3  2  9  3 15  6 11 11  3  .  .  .  2

      B   286 0.016 4.203 0.068  6  8  6  3  7  7  7  2  2  6  . 14  3  .  .  .  .  3  3  1  1  5  .  9  1  .  1  .  2  .  .  1
      H  1152 0.065 4.321 0.283  9  8  5  2  8  4  4  5  7  6  .  7  4  1  .  .  .  3  5  .  2  4  .  8  2  1  .  .  4  .  .  1

      T   400 0.023 3.787 0.086  9  8  3  1  1  6  7  7  9  4  . 12  2  1  .  .  .  .  .  .  .  .  . 16  1  .  .  .  7  .  .  .
      S   212 0.012 3.795 0.046 15 11  4  1  1  5  9 10  7  5  . 12  1  2  .  .  1  1  .  .  .  .  .  5  3  .  .  .  5  .  .  1
      D   927 0.053 3.826 0.202 10  6  3  3  1 11  7  7  7  4  . 15  2  4  .  .  1  .  .  .  .  .  .  7  1  .  .  .  9  .  .  1
      Z   716 0.041 3.872 0.158 10  7  4  2  2  7  8  8 10  8  . 14  5  3  .  .  1  .  .  .  .  .  .  6  .  .  .  .  2  .  .  2
      X   150 0.009 3.697 0.032  7  7  4  3  3  9  5  7 10  5  . 20  7  9  .  1  1  .  .  .  .  .  .  .  .  .  .  .  1  .  .  3
      J   126 0.007 3.779 0.027  6  9  2  2  2  8  7  9  9  6  . 19  6  5  1  .  1  .  .  .  .  .  .  2  .  .  .  .  2  .  .  4

      W  1436 0.082 2.055 0.168 51 30  1  .  .  1  3  2  1  2  .  4  1  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1
      Ñ   193 0.011 2.067 0.023 48 32  2  1  .  .  5  1  2  1  .  3  1  3  .  .  1  .  .  .  1  .  1  .  .  .  .  .  .  .  .  .

      P    17 0.001 1.646 0.002 47 35  .  .  .  .  .  .  .  .  6 12  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

      I   186 0.011 2.830 0.030 31 35  1  1  .  4  4  1  1  1  .  5  .  2  .  1  1  2  1  1  1  .  1  1  1  1  .  .  .  .  .  7
      Y   885 0.050 3.734 0.188 23 16  3  1  3  3  3  7  9  6  1  8  3  1  .  .  .  1  1  .  1  1  .  4  .  .  .  .  1  .  .  2
      A   685 0.039 3.780 0.147 18 22  .  .  .  2  9  3  4  2  1  6  1  .  .  1  2  2  7  .  1  5  1  1  4  3  .  .  .  .  .  2
      O   365 0.021 3.673 0.076 20 25  1  1  1  3  9  4  3  2  3  7  .  1  .  .  2  2  4  2  .  1  1  .  1  1  .  1  .  .  .  4
      U   456 0.026 2.639 0.068 32 38  3  .  .  1  3  1  1  1  .  5  .  1  .  .  .  3  .  .  1  .  .  3  .  .  .  .  .  .  .  3

      ?   291 0.017 3.793 0.063  7  7  9  1  2  1  2  1  1  1  .  5  1  1  1  4 26  1  2  1  .  1  . 14  1  .  1  .  2  .  .  6
        ----- ----- ----- ----- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    TOT 17594 1.000 3.198 3.198 12 10  4  1  2  3  3  2  3  2  0  6  2  1  0  8  5  2  5  1  1  4  1  9  3  3  1  0  1  0  0  2


  Coincidence: if we keep the spaces that come from the line breaks, we get exactly 20000 digraphs.
  
  It seems that (p) is basically a version of (d) (dc) (dcc) (h) (hc) (hcc), which are themselves very similar
  to each other,
      
  Let's try to see if there is any difference between the location of "H" words 
  and that of the corresponding "D" words.
  
  cat .voyn.fsg \
    | tr ' ' '\012'  \
    | egrep '^[A-Z248][A-Z248]*$' \
    | head -6400 \
    | enum-words-in-blocks -v WPB=100 \
    | sort +0.5 -0.99 \
    | make-word-location-map \
        -v MAXLEN=12 \
        -v CTWD=1 \
        -v NBLOCKS=64 \
        -v PERCENT=0 \
    > .voyn.map
    
  After some manual editing, I extracted the pairs of words that (1) differ
  only by "H"/"D" switch, and (2) have together at least 5 occurrences.
  Here are their location maps:

       1 2OEHCC8G     ................1...............................................
       5 2OEDCC8G     ........................1............................11.2.......
                      ----------------------------------------------------------------
       1 4OEHCC8G     .........................................................1......
       8 4OEDCC8G     ..............1...1..........1.2............1...........1.....1.
                      ----------------------------------------------------------------
      23 4OHAE        .............1...11..12.....21.1..11...1.1.1...1.2112..1........
     106 4ODAE        211.4111..41.....214562....131..112341142111.261.524211275112..1
                      ----------------------------------------------------------------
       1 4OHAEG       ........1.......................................................
       6 4ODAEG       ....2............1......1.....................1..........1......
                      ----------------------------------------------------------------
       1 4OHAL        ..1.............................................................
       4 4ODAL        1......................1.........1....1.........................
                      ----------------------------------------------------------------
      15 4OHAM        ................213.....1...1......1.2.........12...1...........
      85 4ODAM        .........3.2..12536.341.4...21.11.1111431...1.243..352.15421...1
                      ----------------------------------------------------------------
      22 4OHAN        .....1..2......2.11...........312.3....2..1..1.........2........
     150 4ODAN        4843481..3.....1142.2525231.523612746723731.1.11.25511.1131.2.21
                      ----------------------------------------------------------------
      14 4OHAR        1.1...1........1.....1.....11.....11...1...........1...1...11...
      47 4ODAR        311.122.122......1........1231...14112.1...1.2.1..311...111...2.
                      ----------------------------------------------------------------
      46 4OHC8G       ...11111.....11.2432.11..2.....1.1....2...2...11131...11..3222..
     161 4ODC8G       1419322311.2.55.31.55793452..1.53.1.112...1414.4143.247211632553
                      ----------------------------------------------------------------
       2 4OHCC8       ............1................................................1..
       5 4ODCC8       ....1..1.....................................1...........1...1..
                      ----------------------------------------------------------------
      40 4OHCC8G      ...21.1.....131.522...1...12..32.......11..1..1..1..4.11....1.1.
     152 4ODCC8G      3.48..313.1134437942213314...1.91252111..22...25723.213252523311
                      ----------------------------------------------------------------
       7 4OHCCG       ...1.............1.........1...................111...........1..
      85 4ODCCG       .12..3.531..112..31.1.21...2..13532.31..1131.11242.12.3.413.1223
                      ----------------------------------------------------------------
       8 4OHCG        ........1........1.............1....1.....2......11.............
      40 4ODCG        ..22..21133....1....2..1.112.....1.1....11.1.1.1.1....2...2..114
                      ----------------------------------------------------------------
      26 4OHG         ..1....1...1......1..1......2.1....22..14....2..22..1......11...
      58 4ODG         33.1221...11...4.1..2.2.......1113.12.1.2...1221.1223.31...1.22.
                      ----------------------------------------------------------------
       6 4OHOE        ................1..1....................2........1.........1....
      18 4ODOE        ......1.......1.2.....11....1.111.....11.11......111........1...
                      ----------------------------------------------------------------
       2 4OHSC8G      ..............................1....................1............
       7 4ODSC8G      .1............1.............11.1....................11..........
                      ----------------------------------------------------------------
       2 4OHT8G       ......1................1........................................
      10 4ODT8G       1...1..1...............1.....1........2......1.......2..........
                      ----------------------------------------------------------------
       3 4OHTC8G      ........................1............................1.....1....
       7 4ODTC8G      ....................1......................1.........12.1..1....
                      ----------------------------------------------------------------
       2 4OHTCG       ............................11..................................
       4 4ODTCG       ..............................1...................11...........1
                      ----------------------------------------------------------------
       3 4OHTG        .....................1............11............................
       6 4ODTG        ..............1.....1...1...1.........................1.....1...
                      ----------------------------------------------------------------
       1 4OHZCG       .............................................1..................
       4 4ODZCG       ...........1........................1...........1......1........
                      ----------------------------------------------------------------
       1 EHAM         ..................1.............................................
       5 EDAM         ...........1..........1...............2.........1...............
                      ----------------------------------------------------------------
       1 EHAN         1...............................................................
       5 EDAN         .......11...............1.............1........................1
                      ----------------------------------------------------------------
       2 EHC8G        ..1..........................................1..................
       7 EDC8G        .......1...1.1..................................1.1...11........
                      ----------------------------------------------------------------
       2 EHCC8G       .............1.................................1................
       6 EDCC8G       .......11..1..1.........1......................1................
                      ----------------------------------------------------------------
       2 GHAN         1..........1....................................................
       3 GDAN         ....1...................1...................................1...
                      ----------------------------------------------------------------
       6 GDC8G        ............1.........1.1....................1..............1.1.
       8 GHC8G        ......1.................1..1.................4.............1....
                      ----------------------------------------------------------------
       3 GHCC8G       ......................1...1....1................................
      10 GDCC8G       ......1.................1.......11........1..1....1.......11.1..
                      ----------------------------------------------------------------
       4 GHCCG        ............1................1...1...........1..................
       7 GDCCG        1........................1...1..11...1.........1................
                      ----------------------------------------------------------------
       1 OEHAE        ...........................1....................................
       4 OEDAE        ..............................1..........11...................1.
                      ----------------------------------------------------------------
       1 OEHAM        ........................................1.......................
       9 OEDAM        ....................1......1.1......1......21......1..........1.
                      ----------------------------------------------------------------
       2 OEHAN        ...........................1.............1......................
      24 OEDAN        .....1.................2.1......2..1111142..1.1...121.........1.
                      ----------------------------------------------------------------
       1 OEHAR        ...........................1....................................
       6 OEDAR        1..................................1....11.1............1.......
                      ----------------------------------------------------------------
       3 OEHC8G       ..1..................1....................1.....................
      19 OEDC8G       .....12....11.1.......22.1.............1..111.............121...
                      ----------------------------------------------------------------
       2 OEHCC8G      .............................1........1.........................
      15 OEDCC8G      ...1....................11......2.....1.......2...121...1.1..1..
                      ----------------------------------------------------------------
      20 OHAE         ......1..1.1..........1....13.1...1.1112..........1.11.........2
      21 ODAE         ..11..1.....2......1....1111......1.....2..111.1..1........1.11.
                      ----------------------------------------------------------------
       2 ODAEG        ........................1...........1...........................
       3 OHAEG        .........................1............1............1............
                      ----------------------------------------------------------------
      13 OHAM         ...............1..........111....1..1.1.1..........1..21...1....
      33 ODAM         ...1.1..11..1..2.12.1...1.....2.3...12.2....3.....1....1211.1..1
                      ----------------------------------------------------------------
      25 OHAN         .1...11....2..............1122..13.1.11....12..1..111...........
      41 ODAN         ......1112.21..........2......1.212323.121211..11.11..1....1..21
                      ----------------------------------------------------------------
      19 ODAR         1..1.1..11.31.........1....2....11......1.1.......2...........1.
      22 OHAR         .133..1...1.1.1.......1.12.....1..1.1.....1...1...........11....
                      ----------------------------------------------------------------
       2 OHC8AR       ............1................................................1..
       3 ODC8AR       .............1..............................................2...
                      ----------------------------------------------------------------
      44 ODC8G        ...21.12..121..1.1.1...213.....1..1.........111......1....113644
      50 OHC8G        ..133.1...122411.1..1.3.13......1..1......211..1....1.21.112241.
                      ----------------------------------------------------------------
      16 ODCCG        1.....1.2......1.........1...111.2........1.111............1....
      18 OHCCG        ......11..1..................1..21..11....21..1.1......11..1.1..
                      ----------------------------------------------------------------
      11 ODCG         1......1..................11.....1..............1............113
      13 OHCG         ...1..111......1......2..........1....1...12................1...
                      ----------------------------------------------------------------
       3 OHCOE        ..............1............................1...................1
       3 ODCOE        ..........................1...................1.........1.......
                      ----------------------------------------------------------------
      12 ODG          ...........3..........11.......1...1......1..11...11............
      17 OHG          ..11...1..2.1..1.......1.1......1111...1..1.......1........1....
                      ----------------------------------------------------------------
       6 ODOE         ........1.............1...1.1............................1....1.
       8 OHOE         ......1........1................11.1.....1...................11.
                      ----------------------------------------------------------------
       3 ODSC8G       .1..........................................1...............1...
       4 OHSC8G       ...........................1.1.....................1......1.....
                      ----------------------------------------------------------------
       2 OHSCG        .............................1..1...............................
       3 ODSCG        ......1......................1...........1......................
                      ----------------------------------------------------------------
       2 ODTC8G       ..................................1...........1.................
       3 OHTC8G       .............................1........................1.....1...
                      ----------------------------------------------------------------
       4 OHTCG        ...........................1.1........................1....1....
       6 ODTCG        1.........................1...1.....1...........1.......1.......
                      ----------------------------------------------------------------
       2 ODTG         ..........1....................1................................
       2 OHTG         ............1.............................................1.....
                      ----------------------------------------------------------------
       7 SCCHG        ..11............2.....1....1..........1.........................
       8 SCCDG        1...1....1.......................1....1......1.....1.........1..
                      ----------------------------------------------------------------
       6 SCHG         ......1........1..................2..11.........................
      11 SCDG         ...1...........1..............1.1.21.1.........1.1............1.
                      ----------------------------------------------------------------
      13 SCHZG        ..1......1..1.....................131..2.............11....1....
      19 SCDZG        ....22........2.........1.........1122.1......11.11..1..........
                      ----------------------------------------------------------------
       1 SHZC8G       .............1..................................................
       6 SDZC8G       ...............1......1.......................1.......2...1.....
                      ----------------------------------------------------------------
       3 SHZCG        ................1....................................1.....1....
       5 SDZCG        ..............1....................1............1....1...1......
                      ----------------------------------------------------------------
      12 SHZG         .........11..........1.............2.1.1.1...........2....11....
      24 SDZG         ...1..1.2.22.............11.1........11..1...21.........1.112.11
                      ----------------------------------------------------------------
       2 TCCHG        ..................1...............1.............................
      11 TCCDG        ..1............1.1.....111.........1........1....1....1..1......
                      ----------------------------------------------------------------
       4 TCHG         ....1....................1.........1..................1.........
      12 TCDG         ..1..1...............21..............1.......11....1..1...1..1..
                      ----------------------------------------------------------------
      17 TCHZG        .1......1....1.................1...123.11............11...2..1..
      21 TCDZG        ......1.1.....4...11.1.11...1....11..2......1.....1.1....1.1....
                      ----------------------------------------------------------------
       1 THZ8G        .......................................................1........
       5 TDZ8G        .......................2..........................1...1...1.....
                      ----------------------------------------------------------------
       2 THZC8G       ..1.........1...................................................
       5 TDZC8G       ...............1......1..................................1...2..
                      ----------------------------------------------------------------
       1 THZCG        ......................1.........................................
       9 TDZCG        ...11.......1....1........11......1..............1..........1...
                      ----------------------------------------------------------------
      20 THZG         1.........2......1.......1.121....121.1...2.......1....1...11...
      35 TDZG         1.1....11222..2..1..2..1......11..12..11.2..211...1.1...1.2....1
                      ----------------------------------------------------------------
       3 DAE          1........1.....................................................1
       8 HAE          .............................1...1....211............1.1........
                      ----------------------------------------------------------------
       4 HAM          ...............1...........................1...1.1..............
       6 DAM          ....................1.............1..1..1...1.....1.............
                      ----------------------------------------------------------------
       4 HAN          ...............1...1...1............1...........................
      14 DAN          ..2.1...11.......................1....1132.............1........
                      ----------------------------------------------------------------
       3 DAR          .......................1...1....1...............................
       5 HAR          ................................1.............1...1..1.....1....
                      ----------------------------------------------------------------
      11 DC8G         .....1.................31.1...........1........1.............2.1
      20 HC8G         1...2.1.........1.....2.1.1......1........1...1...1......112..21
                      ----------------------------------------------------------------
       4 HCC8G        ..............1....1........................1...............1...
      10 DCC8G        .1.21......11..1......1..1.............1........................
                      ----------------------------------------------------------------
       3 DOE          .......1..1..............................................1......
       6 HOE          .....1................................12.1............1.........
                      ----------------------------------------------------------------
       2 DSCG         .1.................1............................................
       3 HSCG         ............................1...1...............1...............
                      ----------------------------------------------------------------
       1 DTC8G        .....................1..........................................
      11 HTC8G        ..1..........2.1......1..........11...............1.111.........
                      ----------------------------------------------------------------
       2 HTCG         ......................................2.........................
       4 DTCG         .....1.........................1......1............1............
                      ----------------------------------------------------------------
       2 DZCG         1................................................1..............
       3 HZCG         .1.......................................................1..1...
                      ----------------------------------------------------------------
  
  While this data does not prove the equivalence of "H" and "D",
  it seems basically compatible with it.