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$ perl -v
This is perl 5, version 14, subversion 2 (v5.14.2) built for darwin-th
+read-multi-2level

$ uname -a
Darwin ganymede 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:
+48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

foreach my $x (3 .. $rep ) {
    foreach my $y (2 .. $x-1 ) {
...
        }
    }
}