Task: Program Execution
Input (English): 9, 4, u, b, 1, 8, o
Output (English): [['9', '4', 'u', 'b', '1', '8'], ['9', '4', 'u', 'b', '1', 'o'], ['9', '4', 'u', 'b', '8', 'o'], ['9', '4', 'u', '1', '8', 'o'], ['9', '4', 'b', '1', '8', 'o'], ['9', 'u', 'b', '1', '8', 'o'], ['4', 'u', 'b', '1', '8', 'o']]