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: If it is windy, then Jennifer is a lawyer. Michael is not a mechanic. If Jennifer were a lawyer, then it is windy. It is sunny if and only if Michael is a mechanic. It is windy if and only if it is sunny.
It is windy if and only if Jennifer is a lawyer can be inferred via the biconditional introduction rule. Jennifer is a lawyer if and only if it is windy can be inferred via the biconditional introduction rule. If it is sunny, then Michael is a mechanic can be inferred via the biconditional elimination rule. If it is windy, then it is sunny can be inferred via the biconditional elimination rule. If Michael were a mechanic, then it is sunny can be inferred via the biconditional elimination rule. If it is sunny, then it is windy can be inferred via the biconditional elimination rule. It is not sunny can be inferred via the biconditional elimination rule.