func0 = out
func1(in) = out
func1(out) = out
func2(in, in) = out
func2(in, out) = out
func2(out, in) = out
func2(out, out) = out
test0
test1(in)
test1(out)
test2(in, in)
test2(in, out)
test2(out, in)
test2(out, out)