What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If Sarah goes running, then it is sunny. If Sarah goes running, then it is sunny. It is sunny if and only if Sarah is running.
If it is sunny, then Sarah is running can be inferred via the biconditional elimination rule. If Sarah goes running, then it is sunny can be inferred via the biconditional elimination rule.