Task: Program Execution
Input (English): 9, 4, Z, 0, 1, 6, 7
Output (English): [['9', '4', 'Z', '0', '1', '6'], ['9', '4', 'Z', '0', '1', '7'], ['9', '4', 'Z', '0', '6', '7'], ['9', '4', 'Z', '1', '6', '7'], ['9', '4', '0', '1', '6', '7'], ['9', 'Z', '0', '1', '6', '7'], ['4', 'Z', '0', '1', '6', '7']]