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: Elisabeth is a mechanic or Elisabeth is a bartender. If it is late, then Mary is running. Elisabeth is not a mechanic or it is late. For all x, if x goes running, then x is excited. If Elisabeth were a bartender, then Mary is excited.
Elisabeth is a bartender or it is late can be inferred via the resolution rule.