1 2 10 20 () []
1 2 3 20 () []
1 2 3 5 () []
1 2 5 3 () []
1 2 10 20 () [('e', ['x', 'y', 'z'])]
1 2 5 3 () [('e', ['x', 'y', 'z'])]
1 2 3 5 (['x', 'y', 'z'],) []
1 2 3 5 (['x', 'y', 'z'],) [('y', 9), ('z', 5)]
1 2 3 5 (['x', 'y', 'z'], 'blorp', 'wee') [('y', 9), ('z', 5)]