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 cold or it is not windy. It is not sunny or it is windy. If Susan writes a letter, then it is cold. It is sunny or Susan is writing a letter.
Susan is writing a letter or it is windy can be inferred via the resolution rule. If it is windy, then it is cold can be inferred via the rewriting rule.