Horizontal segments: 6-12, 13-19, 20-32, 34-40, 41-47, 55-61, 62-68, 69-75, 76-82, 90-95, 97-102, 104-109, 111-116, 118-123, 125-130, 132-137, 139-144, 146-151, 155-158, 161-164, 174-179