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perl -v
This is perl 5, version 14, subversion 2 (v5.14.2) built for MSWin32-x
+86-multi-thread

#!/usr/bin/perl -w
#use strict;
use warnings;
...
my $totalsizewants = total_size(\@wants);
print "\nThe size of wants is $sizewants bytes.\n";
print "The size of wants including references is $totalsizewants bytes
+.\n";