Task: Program Execution
Input (English): 7, D, 4, 9, P, 4
Output (English): [['7', 'D', '4', '9', 'P'], ['7', 'D', '4', '9', '4'], ['7', 'D', '4', 'P', '4'], ['7', 'D', '9', 'P', '4'], ['7', '4', '9', 'P', '4'], ['D', '4', '9', 'P', '4']]