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if( exists $hash{$key} ){
    &$hash{$key};
...
else {
    &$hash{'default_action'};
}

s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)