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 Barbara were an electrician, then it is not late. It is late or Joseph is not playing tennis. Joseph is playing tennis or it is overcast. If it is overcast, then it is late.
If Joseph plays tennis, then it is late can be inferred via the rewriting rule.