Task: Program Execution
Input (English): 7, M, I, 2, P, o, 9
Output (English): [['7', 'M', 'I', '2', 'P', 'o'], ['7', 'M', 'I', '2', 'P', '9'], ['7', 'M', 'I', '2', 'o', '9'], ['7', 'M', 'I', 'P', 'o', '9'], ['7', 'M', '2', 'P', 'o', '9'], ['7', 'I', '2', 'P', 'o', '9'], ['M', 'I', '2', 'P', 'o', '9']]