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 bored or it is cold. If Patricia writes a letter, then Thomas is playing a game. Elisabeth is not bored or Patricia is writing a letter. If it snows, then Thomas is playing a game. If it is cold, then it is snowing.
If it is cold, then Thomas is playing a game can be inferred via the transitivity rule. It is cold or Patricia is writing a letter can be inferred via the resolution rule.