Task: Program Execution
Input (English): D, S, B, 9, t, 7
Output (English): [['D', 'S', 'B', '9', 't'], ['D', 'S', 'B', '9', '7'], ['D', 'S', 'B', 't', '7'], ['D', 'S', '9', 't', '7'], ['D', 'B', '9', 't', '7'], ['S', 'B', '9', 't', '7']]