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#!/usr/bin/perl
use warnings;
...
my ($f1, $f2) = qw( 1.csv 2.csv );

find_matches($f1, build_regex($f2));

($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,