Task: Program Execution
Input (English): r, R, 8, 2, D, A
Output (English): [['r', 'R', '8', '2', 'D'], ['r', 'R', '8', '2', 'A'], ['r', 'R', '8', 'D', 'A'], ['r', 'R', '2', 'D', 'A'], ['r', '8', '2', 'D', 'A'], ['R', '8', '2', 'D', 'A']]