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#!/usr/bin/perl
use warnings;
...
    my ($letter, $string) = @$tuple;
    say "$letter: ", grep index($_, $letter) != -1, split /;/, $string
+;
}

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($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,