Task: Program Execution
Input (English): M, 9, E, 0, 7, F
Output (English): [['M', '9', 'E', '0', '7'], ['M', '9', 'E', '0', 'F'], ['M', '9', 'E', '7', 'F'], ['M', '9', '0', '7', 'F'], ['M', 'E', '0', '7', 'F'], ['9', 'E', '0', '7', 'F']]