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  1. or download this
    #!/usr/bin/perl
    use warnings;
    ...
    
    say 'Show the ten highest numbers that can be expressed';
    say for (sort { $b <=> $a } keys %count)[0 .. 9];
    
  2. or download this
    $sum += $_ for $expression =~ /([-+]?[0-9]+)/g;
    
  3. 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,