Task: Program Execution
Input (English): B, F, S, r, u, 6, 5
Output (English): [['B', 'F', 'S', 'r', 'u', '6'], ['B', 'F', 'S', 'r', 'u', '5'], ['B', 'F', 'S', 'r', '6', '5'], ['B', 'F', 'S', 'u', '6', '5'], ['B', 'F', 'r', 'u', '6', '5'], ['B', 'S', 'r', 'u', '6', '5'], ['F', 'S', 'r', 'u', '6', '5']]