Task: Program Execution
Input (English): G, F, K, Z, 4, U
Output (English): [['G', 'F', 'K', 'Z', '4'], ['G', 'F', 'K', 'Z', 'U'], ['G', 'F', 'K', '4', 'U'], ['G', 'F', 'Z', '4', 'U'], ['G', 'K', 'Z', '4', 'U'], ['F', 'K', 'Z', '4', 'U']]