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 it snows, then Patricia is playing tennis. If Joseph drinks water, then Richard is sleeping. If it is cloudy, then Patricia is playing tennis. It is snowing or Joseph is drinking water. If Richard sleeps, then it is cloudy.
If Joseph drinks water, then it is cloudy can be inferred via the transitivity rule. If Richard sleeps, then Patricia is playing tennis can be inferred via the transitivity rule.