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 Patricia were an electrician, then Richard is not playing a game. Richard is playing a game. It is cold.
Patricia is not an electrician can be inferred via the modus tollens rule. Richard is playing a game and it is cold can be inferred via the conjunction rule. It is cold and Richard is playing a game can be inferred via the conjunction rule.