Task: Program Execution
Input (English): U, 9, F, 1, 9, H
Output (English): [['U', '9', 'F', '1', '9'], ['U', '9', 'F', '1', 'H'], ['U', '9', 'F', '9', 'H'], ['U', '9', '1', '9', 'H'], ['U', 'F', '1', '9', 'H'], ['9', 'F', '1', '9', 'H']]