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                            $_='`$t`
                        `.=lc for<>;u($_`
...
                #``````   ````#  babbage  #`
                  #`````````` # # # # #`
                     # ` ` ` `# ##`

perl vigenere.pl | perl babbage.pl

$,=42;for(34,0,-3,9,-11,11,-17,7,-5){$*.=pack'c'=>$,+=$_}for(reverse s
+plit//=>$*
){$%++?$ %%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[$%++]}