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: John is bored. If Susan listens to a song, then John is not bored. Michael is writing a letter.
Susan is not listening to a song can be inferred via the modus tollens rule. John is bored and Michael is writing a letter can be inferred via the conjunction rule. Michael is writing a letter and John is bored can be inferred via the conjunction rule.