What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Barbara is playing a game if and only if William is fast. William is not fast. James is not drinking water. It is raining if and only if James is drinking water.
William is not fast and James is not drinking water. James is not drinking water and William is not fast. If Barbara plays a game, then William is fast. If it rains, then James is drinking water. If William were fast, then Barbara is playing a game. If James drinks water, then it is raining. Barbara is not playing a game. It is not raining.