Task: Program Execution
Input (English): d, 3, 7, r, 4, w, s
Output (English): [['d', '3', '7', 'r', '4', 'w'], ['d', '3', '7', 'r', '4', 's'], ['d', '3', '7', 'r', 'w', 's'], ['d', '3', '7', '4', 'w', 's'], ['d', '3', 'r', '4', 'w', 's'], ['d', '7', 'r', '4', 'w', 's'], ['3', '7', 'r', '4', 'w', 's']]