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 Richard sleeps, then it is raining. If it rains, then Sarah is playing a game. Richard is sleeping.
It is raining can be inferred via the modus ponens rule. If Richard sleeps, then Sarah is playing a game can be inferred via the transitivity rule.