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: Elisabeth is not fast. If Patricia listens to a song, then Thomas is playing a game. Thomas is not playing a game. If Jessica plays tennis, then Elisabeth is fast. Jessica is playing tennis or Susan is sleeping.
Patricia is not listening to a song can be inferred via the modus tollens rule. Jessica is not playing tennis can be inferred via the modus tollens rule. Elisabeth is not fast and Thomas is not playing a game can be inferred via the conjunction rule. Thomas is not playing a game and Elisabeth is not fast can be inferred via the conjunction rule.