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 Karen plays tennis, then it is not overcast. Karen is playing tennis if and only if Joseph is a poet. It is overcast.
Karen is not playing tennis can be inferred via the modus tollens rule. If Karen plays tennis, then Joseph is a poet can be inferred via the biconditional elimination rule. If Joseph were a poet, then Karen is playing tennis can be inferred via the biconditional elimination rule.