1. After the initial letter S
     for the second letter:
	      a-cg  ch-d  e-g  h-l  m-q  r-s  t  u-z
     use #:    2      3    4    5    6    7   8   9

2. After the initial letters Qu
      for the third letter:
	      a-d  e-h  i-n  o-q  r-t  u-x  y-z
     use #:    3    4    5    6    7    8    9

3. After other initial consonants
     for the second letter:
	      a-d  e-h  i-n  o-q  r-t  u-x  y-z
     use #:    3    4    5    6    7    8    9

4.  After initial vowels (a,e,i,o,u)
      for the second letter:
              a-c  d-k  l-m  n-o  p-q  r  s-t  u-z
      use #:   2    3    4    5    6   7   8    9
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5.  For an additional number
       for the third letter:
	      a-d  e-h  i-l  m  n-q  r-t  u-w  x-z
       use #:  2    3    4   5   6    7    8    9