Task: Program Execution
Input (English): 1, 6, 8, p, r, x, 7
Output (English): [['1', '6', '8', 'p', 'r', 'x'], ['1', '6', '8', 'p', 'r', '7'], ['1', '6', '8', 'p', 'x', '7'], ['1', '6', '8', 'r', 'x', '7'], ['1', '6', 'p', 'r', 'x', '7'], ['1', '8', 'p', 'r', 'x', '7'], ['6', '8', 'p', 'r', 'x', '7']]