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       undef EXPR
       undef   Undefines the value of EXPR, which must be an lvalue.  
+Use only
...
               "undef $hash{$key}" will probably not do what you expec
+t on
               most predefined variables or DBM list values, so don't 
+do that;
               see delete.)  Always returns the undefined value.

$,=42;for(34,0,-3,9,-11,11,-17,7,-5){$*.=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[$%++]}