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  1. or download this
    eval {
    print "Every command executed";
    warn " must be present here ";
    die @ARGV;
1 } or die $@;
  2. or download this
    my %ops = ( add      => '+',
            subtract => '-',
...
eval "sub $_ { shift() $ops{$_} shift() }" for keys %ops;

print add(4, 6);
  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,