Task: Program Execution
Input (English): L, d, 9, O, 9, u, Z
Output (English): [['L', 'd', '9', 'O', '9', 'u'], ['L', 'd', '9', 'O', '9', 'Z'], ['L', 'd', '9', 'O', 'u', 'Z'], ['L', 'd', '9', '9', 'u', 'Z'], ['L', 'd', 'O', '9', 'u', 'Z'], ['L', '9', 'O', '9', 'u', 'Z'], ['d', '9', 'O', '9', 'u', 'Z']]