Task: Program Execution
Input (English): V, f, 6, 1, 3, W, 6
Output (English): [['V', 'f', '6', '1', '3', 'W'], ['V', 'f', '6', '1', '3', '6'], ['V', 'f', '6', '1', 'W', '6'], ['V', 'f', '6', '3', 'W', '6'], ['V', 'f', '1', '3', 'W', '6'], ['V', '6', '1', '3', 'W', '6'], ['f', '6', '1', '3', 'W', '6']]