[(0, 1), (1, 2), (2, 3), (3, 4)]
[(10, 1), (11, 2), (12, 3), (13, 4)]
[(0, 'h'), (1, 'e'), (2, 'l'), (3, 'l'), (4, 'o')]
[(2, 'W'), (3, 'O'), (4, 'R'), (5, 'L'), (6, 'D')]
[(0, 1), (1, 2), (2, 3)]
[(-1, 1), (0, 2), (1, 3)]
[(0, 1), (1, 2), (2, 3)]
[(5, 1), (6, 2), (7, 3)]