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: William is a police officer if and only if Jessica is poor. Jessica is poor. If William were a police officer, then James is a writer.
If William were a police officer, then Jessica is poor can be inferred via the biconditional elimination rule. If Jessica were poor, then William is a police officer can be inferred via the biconditional elimination rule.