Task: Program Execution
Input (English): D, H, 2, Z, 5, H, 7
Output (English): [['D', 'H', '2', 'Z', '5', 'H'], ['D', 'H', '2', 'Z', '5', '7'], ['D', 'H', '2', 'Z', 'H', '7'], ['D', 'H', '2', '5', 'H', '7'], ['D', 'H', 'Z', '5', 'H', '7'], ['D', '2', 'Z', '5', 'H', '7'], ['H', '2', 'Z', '5', 'H', '7']]