#!/usr/bin/perl

# Copyright 2002-2019, Paul Johnson (paul@pjcj.net)

# This software is free.  It is licensed under the same terms as Perl itself.

# The latest version of this software should be available from my homepage:
# http://www.pjcj.net

use strict;
use warnings;

my $i = 1;
my $j = 0;

for my $y (0, 1, 1, 1) {
    for my $z (0, 0, 1) {
        my $x = $y ^ $z;
        $x = ($y xor $z);

        my $p = ($i xor $y);
        $p = ($j xor $y);
        $p ^= $y;
    }
}