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 it is overcast, then Karen is excited. For all y, y is not poor. James is poor if and only if Karen is excited.
If James were poor, then Karen is excited can be inferred via the biconditional elimination rule. If Karen were excited, then James is poor can be inferred via the biconditional elimination rule.