What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Patricia is a carpenter or Barbara is playing a game. Elisabeth is not playing tennis. If Patricia were a carpenter, then Elisabeth is playing tennis. If Robert were a nurse, then it is not windy. If Barbara plays a game, then Elisabeth is playing tennis.
Since the premises are contradictory, we can infer anything from them.