{0: set([1, 2, 3]), 1: set([2, 3, 4]), 2: set([3, 4, 5]), 3: set([4, 5, 6]), 4: set([5, 6, 7]), 5: set([8, 6, 7]), 6: set([8, 9, 7]), 7: set([8, 9]), 8: set([9]), 9: set([])}