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: Charles is cooking if and only if it is snowing. It is not windy. It is windy if and only if it is snowing. For all x_15, if x_15 sleeps, then x_15 is cooking.
If Charles cooks, then it is snowing can be inferred via the biconditional elimination rule. If it is windy, then it is snowing can be inferred via the biconditional elimination rule. If it snows, then Charles is cooking can be inferred via the biconditional elimination rule. If it snows, then it is windy can be inferred via the biconditional elimination rule. It is not snowing can be inferred via the biconditional elimination rule.