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: David is happy or it is not windy. If it snows, then it is windy. If David were happy, then it is snowing.
If David were happy, then it is windy can be inferred via the transitivity rule. If it is windy, then David is happy can be inferred via the rewriting rule.