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: If Linda were a server, then it is not late. It is late if and only if Joseph is playing tennis. Karen is a soldier or Joseph is playing tennis. If Karen were a soldier, then it is late.
If it is late, then Joseph is playing tennis can be inferred via the biconditional elimination rule. If Joseph plays tennis, then it is late can be inferred via the biconditional elimination rule.