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use Set::Object;
print "1..4\n";
my $a = Set::Object->new("a".."e");
my $b = Set::Object->new("c".."g");
my $c = Set::Object->new();
my $d = $a->unique($b);
print "not " unless $d eq "Set::Object(a b f g)";
print "ok 1\n";
my $e = $b->unique($a);
print "not " unless $e eq "Set::Object(a b f g)";
print "ok 2\n";
my $f = $a->unique($c);
print "not " unless $f eq $a;
print "ok 3\n";
my $g = $a->unique($a);
print "not " unless $g eq "Set::Object()";
print "ok 4 # $g\n";
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