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: Jessica is not a taxi driver. For all x_15, if x_15 were a writer, then x_15 is a taxi driver. Jessica is a writer if and only if Jessica is a poet.
If Jessica were a writer, then Jessica is a poet can be inferred via the biconditional elimination rule. If Jessica were a poet, then Jessica is a writer can be inferred via the biconditional elimination rule.