What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_11, if x_11 sleeps, then x_11 is a writer. For all x_11, x_11 is a writer or x_11 will not sleep. There is at least one x_11 for which if x_11 were a writer, then x_11 is sleeping.
For all x_11, if x_11 sleeps, then x_11 is a writer. There is at least one x_11 for which x_11 is a writer if and only if x_11 will sleep. There is at least one x_11 for which x_11 will sleep if and only if x_11 is a writer.