Task: Program Execution
Input (English): r, 6, u, 9, 7, g
Output (English): [['r', '6', 'u', '9', '7'], ['r', '6', 'u', '9', 'g'], ['r', '6', 'u', '7', 'g'], ['r', '6', '9', '7', 'g'], ['r', 'u', '9', '7', 'g'], ['6', 'u', '9', '7', 'g']]