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