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_10, if x_10 were a cashier, then x_10 is a lawyer. It is windy or Mary is a cashier. Mary is a lawyer if and only if it is windy.
If Mary makes tea, then it is windy can be inferred via the rewriting rule. If Mary were a lawyer, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then Mary is a lawyer can be inferred via the biconditional elimination rule.