Task: Program Execution
Input (English): 7, x, U, 0, l, 2, 5
Output (English): [['7', 'x', 'U', '0', 'l', '2'], ['7', 'x', 'U', '0', 'l', '5'], ['7', 'x', 'U', '0', '2', '5'], ['7', 'x', 'U', 'l', '2', '5'], ['7', 'x', '0', 'l', '2', '5'], ['7', 'U', '0', 'l', '2', '5'], ['x', 'U', '0', 'l', '2', '5']]