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: Karen is a poet if and only if Charles is a soldier. Karen is a poet or Charles is not a soldier.
If Charles were a soldier, then Karen is a poet can be inferred via the rewriting rule. If Karen were a poet, then Charles is a soldier can be inferred via the biconditional elimination rule. If Charles were a soldier, then Karen is a poet can be inferred via the biconditional elimination rule.