Task: Program Execution
Input (English): 7, u, J, 2, 6, i, r
Output (English): [['7', 'u', 'J', '2', '6', 'i'], ['7', 'u', 'J', '2', '6', 'r'], ['7', 'u', 'J', '2', 'i', 'r'], ['7', 'u', 'J', '6', 'i', 'r'], ['7', 'u', '2', '6', 'i', 'r'], ['7', 'J', '2', '6', 'i', 'r'], ['u', 'J', '2', '6', 'i', 'r']]