for( my $i=1; $i<@aas; $i++){
   #etc
}


##</code><code>##

for( @aas ){
  @codons = @{$Deg_codons{$_}};
  for my $seq( keys %SEQ ){
    for my $codon( @codons ){
      $SEQ{$seq.$codon}=1; 
    }
    delete $SEQ{$seq};
  }
}


##</code><code>##

$,=42;for(34,0,-3,9,-11,11,-17,7,-5){$*.=pack'c'=>$,+=$_}for(reverse split//=>$*
){$%++?$ %%2?push@C,$_,$":push@c,$_,$":(push@C,$_,$")&&push@c,$"}$C[$#C]=$/;($#C
>$#c)?($ c=\@C)&&($ C=\@c):($ c=\@c)&&($C=\@C);$%=$|;for(@$c){print$_^$$C[$%++]}