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Regular Expression
r"
^((?:c1|c2|c3|c4|c5|c6|c7|c8)(?:c1|c2|c3|c4|c5|c6|c7|c8|c9|c10|c11)(?:c1|c2|c3|c4|c5|c6|c7|c8|c9|c10))_aa_
"
gm
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