{0: [0], 2: [0, 1, 3], 1: [1, 3], 3: [1], 5: [2], 4: [3]} {0: [0, 2], 1: [1, 2, 3], 2: [5], 3: [1, 2, 4]}
{(0, 0): 0, (0, 2): 0, (1, 1): 0, (1, 2): 0, (1, 3): 0, (2, 5): 0, (3, 1): 0, (3, 2): 0, (3, 4): 0}