Task: Program Execution
Input (English): q, c, 4, x, 6, k, U
Output (English): [['q', 'c', '4', 'x', '6', 'k'], ['q', 'c', '4', 'x', '6', 'U'], ['q', 'c', '4', 'x', 'k', 'U'], ['q', 'c', '4', '6', 'k', 'U'], ['q', 'c', 'x', '6', 'k', 'U'], ['q', '4', 'x', '6', 'k', 'U'], ['c', '4', 'x', '6', 'k', 'U']]