Task: Program Execution
Input (English): 2, Q, R, 2, M, u, 6
Output (English): [['2', 'Q', 'R', '2', 'M', 'u'], ['2', 'Q', 'R', '2', 'M', '6'], ['2', 'Q', 'R', '2', 'u', '6'], ['2', 'Q', 'R', 'M', 'u', '6'], ['2', 'Q', '2', 'M', 'u', '6'], ['2', 'R', '2', 'M', 'u', '6'], ['Q', 'R', '2', 'M', 'u', '6']]