Task: Program Execution
Input (English): B, A, 6, U, 9, 7
Output (English): [['B', 'A', '6', 'U', '9'], ['B', 'A', '6', 'U', '7'], ['B', 'A', '6', '9', '7'], ['B', 'A', 'U', '9', '7'], ['B', '6', 'U', '9', '7'], ['A', '6', 'U', '9', '7']]