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: Linda is not an artist. Patricia is a sailor or Jessica is not making tea. John is a police officer or Jessica is making tea. If John were a police officer, then Linda is an artist. If Linda were an artist, then John is a police officer.
John is not a police officer can be inferred via the modus tollens rule. If Jessica makes tea, then Patricia is a sailor can be inferred via the rewriting rule. John is a police officer if and only if Linda is an artist can be inferred via the biconditional introduction rule. Linda is an artist if and only if John is a police officer can be inferred via the biconditional introduction rule.