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%hash = (key => 'value'); # Removes previous contents of %hash.

$hash{key} = 'value';

$code{$2} = $1;
$code{$3} = $1;
...

while (my $line = <READ>) {
    my ($acid, @codons) = split ' ', $line;
    $code{$_} = $acid for @codons;
}

($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,