What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x were bored, then x is a writer. For all x, if x were a writer, then x is bored. For all x, if x were a writer, then x is bored.
For all x, x is bored if and only if x is a writer. For all x, x is bored if and only if x is a writer. For all x, x is a writer if and only if x is bored. For all x, x is a writer if and only if x is bored.