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 Thomas sleeps, then it is snowing. If it rains, then Jessica is a writer. If Jessica were a writer, then Thomas is sleeping. It is raining.
Jessica is a writer can be inferred via the modus ponens rule. If it rains, then Thomas is sleeping can be inferred via the transitivity rule. If Jessica were a writer, then it is snowing can be inferred via the transitivity rule.