Task: Program Execution
Input (English): b, 4, e, 6, 8, 7, 1
Output (English): [['b', '4', 'e', '6', '8', '7'], ['b', '4', 'e', '6', '8', '1'], ['b', '4', 'e', '6', '7', '1'], ['b', '4', 'e', '8', '7', '1'], ['b', '4', '6', '8', '7', '1'], ['b', 'e', '6', '8', '7', '1'], ['4', 'e', '6', '8', '7', '1']]