What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it is cold, then it is late. If David goes running, then it is cold. If it is late, then David is running. It is not cold.
David is not running. If it is cold, then David is running. If David goes running, then it is late. If it is late, then it is cold.