Task: Program Execution
Input (English): 8, 4, 6, 0, 2, n, u
Output (English): [['8', '4', '6', '0', '2', 'n'], ['8', '4', '6', '0', '2', 'u'], ['8', '4', '6', '0', 'n', 'u'], ['8', '4', '6', '2', 'n', 'u'], ['8', '4', '0', '2', 'n', 'u'], ['8', '6', '0', '2', 'n', 'u'], ['4', '6', '0', '2', 'n', 'u']]