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: Elisabeth is not a poet. If Elisabeth were a poet, then it is snowing. Charles is an electrician. If it snows, then Elisabeth is a poet.
It is not snowing can be inferred via the modus tollens rule. Elisabeth is not a poet and Charles is an electrician can be inferred via the conjunction rule. Charles is an electrician and Elisabeth is not a poet can be inferred via the conjunction rule. Elisabeth is a poet if and only if it is snowing can be inferred via the biconditional introduction rule. It is snowing if and only if Elisabeth is a poet can be inferred via the biconditional introduction rule.