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  1. or download this
    sub foo{return reverse split//,shift} #no semi-colon :)
    my $i = foo("oof rab");
    print $i;
    
  2. or download this
    $_.=($=+(6<<1));print(chr(my$a=$_));$^H=$_+$_;$_=$^H;
    print chr($_-39); # Easy but its ok.