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 John reads a book, then it is windy. John is reading a book or Linda is sad. If John drinks water, then it is not windy. Linda is sad if and only if it is windy.
If Linda were sad, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then Linda is sad can be inferred via the biconditional elimination rule.