Task: Program Execution
Input (English): 7, b, 4, O, 4, d, V
Output (English): [['7', 'b', '4', 'O', '4', 'd'], ['7', 'b', '4', 'O', '4', 'V'], ['7', 'b', '4', 'O', 'd', 'V'], ['7', 'b', '4', '4', 'd', 'V'], ['7', 'b', 'O', '4', 'd', 'V'], ['7', '4', 'O', '4', 'd', 'V'], ['b', '4', 'O', '4', 'd', 'V']]