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SUBSTITUTION
AAAAEAAAARGAAATTTTFTTTTTTTTTTTTTTTTAAAAAAAAILVAAAAAAAA # 1. sequence
...
PERFECT MATCHING ONLY AT BEGIN AND END OF 2. SEQUENCE
AAAAAAAAAAATTTTTTTTGGGGGGGGGGGGGGGGGGGGGTTTTTTTTTAAAAAAA # 1.sequence
TTTTTTTTGGGNNGGGEEGGGEGGGGGGTTTTTTTTT # 2. Sequence