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: Patricia is reading a book or Michael is not a police officer. Elisabeth is making tea if and only if Michael is a police officer.
If Michael were a police officer, then Patricia is reading a book can be inferred via the rewriting rule. If Elisabeth makes tea, then Michael is a police officer can be inferred via the biconditional elimination rule. If Michael were a police officer, then Elisabeth is making tea can be inferred via the biconditional elimination rule.