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String set is usually comes in batches of size 10000  (|S|=10000) 
Alphabet is 3    (|A|=3, A={A,B,C}) 
Size if each string is exactly 63 characters  (|s1| = |s2| = .. = |s_|
+S|| = 63)

ABBCBCAAAAABBCBCACCCAAAAACAAAAABBBBBAAAAABBAAAAAAAABBCCCACCAABC
BCCCBCAACAABBBCAAACCAAAAACAAAAABBBBBAAAAABBAAAAAAAABBCCCACCABBC
ABCCBBBAAAABBABCACABCCCCCCAAAAABBCBBCCCCAAAAAAAAAAAAACCCACCACCC
...

position in a byte:

1  2 | 3  4  5  6  7  8
A  A | Delta between mismatching consecutive characters

00  A
01  B
11  C