Task: Program Execution
Input (English): 8, a, f, 4, 2, H, u
Output (English): [['8', 'a', 'f', '4', '2', 'H'], ['8', 'a', 'f', '4', '2', 'u'], ['8', 'a', 'f', '4', 'H', 'u'], ['8', 'a', 'f', '2', 'H', 'u'], ['8', 'a', '4', '2', 'H', 'u'], ['8', 'f', '4', '2', 'H', 'u'], ['a', 'f', '4', '2', 'H', 'u']]