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: For all x, x is a janitor. Linda is not cooking. Linda is cooking if and only if it is raining.
If Linda cooks, then it is raining can be inferred via the biconditional elimination rule. If it rains, then Linda is cooking can be inferred via the biconditional elimination rule. It is not raining can be inferred via the biconditional elimination rule.