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#!/usr/bin/perl
use warnings;
use strict;
...
$path = path("$path/..")->realpath
    until -e "$path/.marker" || '/' eq $path;
say -e "$path/.marker" ? 'F' : 'Not f', 'ound';

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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,