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#!/usr/bin/perl
use warnings;
...
             substr => q( Substr 'def', 'abc' ),
             subst  => q( subst  'def', 'abc' ),
           });

ok 1 - correct concat
ok 2 - same substr
...
subst  1770916/s     --   -38%   -47%
precat 2860656/s    62%     --   -15%
substr 3350927/s    89%    17%     --

($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,