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: It is windy. If Richard writes a letter, then Joseph is an electrician. Joseph is not an electrician. William is listening to a song.
Richard is not writing a letter can be inferred via the modus tollens rule. It is windy and Joseph is not an electrician can be inferred via the conjunction rule. It is windy and William is listening to a song can be inferred via the conjunction rule. Joseph is not an electrician and it is windy can be inferred via the conjunction rule. Joseph is not an electrician and William is listening to a song can be inferred via the conjunction rule. William is listening to a song and it is windy can be inferred via the conjunction rule. William is listening to a song and Joseph is not an electrician can be inferred via the conjunction rule.