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use Set::Object;
print "1..20\n";
my $a = Set::Object->new("a".."e");
my $b = Set::Object->new("c".."g");
my $d = $a->intersection($b);
Set::Object->as_string_callback(sub { my $self = shift; "(".join(" ", sort $self->members).")" });
print "not " unless $d eq "(c d e)";
print "ok 1\n";
print "not " unless $a eq "(a b c d e)";
print "ok 2\n";
print "not " unless $b eq "(c d e f g)";
print "ok 3\n";
my $e = $a * $b;
print "not " unless $e eq "(c d e)";
print "ok 4\n";
print "not " unless $a eq "(a b c d e)";
print "ok 5\n";
print "not " unless $b eq "(c d e f g)";
print "ok 6\n";
my $f = $b->intersection($a);
print "not " unless $f eq "(c d e)";
print "ok 7\n";
print "not " unless $a eq "(a b c d e)";
print "ok 8\n";
print "not " unless $b eq "(c d e f g)";
print "ok 9\n";
my $g = $b * $a;
print "not " unless $g eq "(c d e)";
print "ok 10\n";
print "not " unless $a eq "(a b c d e)";
print "ok 11\n";
print "not " unless $b eq "(c d e f g)";
print "ok 12\n";
my $h = $a * "x";
print "not " unless $h eq "()";
print "ok 13\n";
print "not " unless $a eq "(a b c d e)";
print "ok 14\n";
my $i = "y" * $a;
print "not " unless $i eq "()";
print "ok 15\n";
print "not " unless $a eq "(a b c d e)";
print "ok 16\n";
my $j = $a * "c";
print "not " unless $j eq "(c)";
print "ok 17\n";
print "not " unless $a eq "(a b c d e)";
print "ok 18\n";
my $k = "e" * $a;
print "not " unless $k eq "(e)";
print "ok 19\n";
print "not " unless $a eq "(a b c d e)";
print "ok 20\n";
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