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  1. or download this
    (?<!n)'t
  2. or download this
    (?<!aren|isn)'t

Variable length lookbehind not implemented in regex m/(?<!aren|isn)'t/
  3. or download this
    (?<!aren)(?<!isn)'t
  4. or download this
    ($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,