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ALLOWED=("AA","AG","GC","GT","CA","CG","TT","TC ");
DISALLOWED=("AC","AT","GG","GA","CC","CT","TG","TA")

CTGTCAGCNNNCCGGTTTTCAAGNNGAGCACACACCAAAAATGCACCAAAGCTTNACATCCATACAAA

C
T 
...
T 
A 
CAAA