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 cooking if and only if William is sleeping. Karen is cooking if and only if Sarah is a sailor. Sarah is not a sailor.
If Karen cooks, then William is sleeping can be inferred via the biconditional elimination rule. If Karen cooks, then Sarah is a sailor can be inferred via the biconditional elimination rule. If William sleeps, then Karen is cooking can be inferred via the biconditional elimination rule. If Sarah were a sailor, then Karen is cooking can be inferred via the biconditional elimination rule. Karen is not cooking can be inferred via the biconditional elimination rule.