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 is sunny, then David is a scientist. If Charles listens to a song, then Richard is cooking. If David were a scientist, then Charles is listening to a song. If Richard were excited, then Thomas is sleeping. For all x_15, if x_15 cooks, then x_15 is excited.
If it is sunny, then Charles is listening to a song can be inferred via the transitivity rule. If David were a scientist, then Richard is cooking can be inferred via the transitivity rule.