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(?<!n)'t
(?<!aren|isn)'t Variable length lookbehind not implemented in regex m/(?<!aren|isn)'t/
(?<!aren)(?<!isn)'t
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,