What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 is a politician or x_13 will sleep. For all x_13, if x_13 were a writer, then x_13 is excited. For all x_13, if x_13 sleeps, then x_13 is a writer. For all x_13, if x_13 were excited, then x_13 is a writer. For all x_13, x_13 is a writer if and only if x_13 is a politician.
For all x_13, if x_13 sleeps, then x_13 is excited. For all x_13, x_13 is a writer if and only if x_13 is excited. For all x_13, x_13 is excited if and only if x_13 is a writer. For all x_13, if x_13 were a writer, then x_13 is a politician. For all x_13, if x_13 were a politician, then x_13 is a writer.