What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it snows, then Linda is a mechanic. Linda is a mechanic if and only if it is late. If Linda were a writer, then it is snowing.
If Linda were a writer, then Linda is a mechanic. If Linda were a mechanic, then it is late. If it is late, then Linda is a mechanic.