Task: Program Execution
Input (English): D, C, 2, d, 7, o
Output (English): [['D', 'C', '2', 'd', '7'], ['D', 'C', '2', 'd', 'o'], ['D', 'C', '2', '7', 'o'], ['D', 'C', 'd', '7', 'o'], ['D', '2', 'd', '7', 'o'], ['C', '2', 'd', '7', 'o']]