What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is sunny if and only if it is cold. Charles is running if and only if it is cold. Charles is running or it is sunny.
If it is sunny, then it is cold. If Charles goes running, then it is cold. If it is cold, then it is sunny. If it is cold, then Charles is running.