Task: Program Execution
Input (English): 4, 5, r, u, 3, r
Output (English): [['4', '5', 'r', 'u', '3'], ['4', '5', 'r', 'u', 'r'], ['4', '5', 'r', '3', 'r'], ['4', '5', 'u', '3', 'r'], ['4', 'r', 'u', '3', 'r'], ['5', 'r', 'u', '3', 'r']]