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Can't use "my $a" in sort comparison at pmonks06082015.pl line 4.

$a
$b
Special package variables when using sort(), see sort. Because of this
+ specialness $a and $b don't need to be declared (using use vars , or
+ our()) even when using the strict 'vars' pragma. Don't lexicalize th
+em with my $a or my $b if you want to be able to use them in the sort
+() comparison block or function.