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: It is not sunny or it is snowing. It is sunny or it is overcast. It is late if and only if it is snowing. It is not overcast.
It is overcast or it is snowing can be inferred via the resolution rule. If it is late, then it is snowing can be inferred via the biconditional elimination rule. If it snows, then it is late can be inferred via the biconditional elimination rule.