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: Michael is writing a letter or it is snowing. Michael is not writing a letter or Robert is bored. It is raining or it is not snowing. If Robert were bored, then it is raining.
It is snowing or Robert is bored can be inferred via the resolution rule. If it snows, then it is raining can be inferred via the rewriting rule.