8 lines
285 B
Text
8 lines
285 B
Text
(define $common-seqs
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(lambda [$xs $ys]
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(match-all [xs ys] [(list char) (list char)]
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[[(loop $i [1 $n] <join _ <cons $c_i ...>> _)
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(loop $i [1 ,n] <join _ <cons ,c_i ...>> _)]
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(map (lambda [$i] c_i) (between 1 n))])))
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(define $lcs (compose common-seqs rac))
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