 
 <prompt> Wetin dem dey call an arrangement of intersecting lines, whether horizontal or vertical? Given the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context: <response>: NARA still dey maintain di Presidential Library system, wey be nationwide network of libraries wey dey preserve and make documents of U.S. presidents since Herbert Hoover available. Di Presidential Libraries include: 