Task: Program Execution
Input (English): 3, 4, 9, r, 6, 2
Output (English): [['3', '4', '9', 'r', '6'], ['3', '4', '9', 'r', '2'], ['3', '4', '9', '6', '2'], ['3', '4', 'r', '6', '2'], ['3', '9', 'r', '6', '2'], ['4', '9', 'r', '6', '2']]