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, if x_13 were a writer, then x_13 is running. For all x_13, x_13 is sad and x_13 will work. For all x_13, if x_13 takes a plane, then x_13 is running. There is at least one x_13 for which x_13 will take a plane or x_13 is a writer.
For all x_13, x_13 is sad. For all x_13, x_13 will work. There is at least one x_13 for which x_13 will go running.