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 Jennifer plays a game, then Jennifer is writing a letter. If it rains, then Jennifer is writing a letter. Jennifer is playing a game or it is raining. If it is cold, then Jennifer is not writing a letter.
Jennifer is writing a letter can be inferred via the disjunction elimination rule.