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: It is windy or Michael is a sailor. If it is windy, then Michael is a carpenter. For all x_8, x_8 is a sailor if and only if x_8 is a carpenter.
If Michael drives a car, then it is windy can be inferred via the rewriting rule. For all x_8, if x_8 were a sailor, then x_8 is a carpenter can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were a carpenter, then x_8 is a sailor can be inferred via the universal biconditional elimination rule.