[(0,1),(0,2),(1,3),(3,4),(2,5),(4,6),(4,7),(3,8),(6,9),(2,9),(8,10),(1,11),(10,11),(5,12),(12,13),(6,14),(7,15),(12,16),(5,17),(11,18),(10,19),(8,20),(7,21),(9,22)]
[(0,1),(1,2),(0,3),(3,4),(2,5),(5,6),(6,7),(6,8),(1,8),(4,9),(9,10),(4,10),(2,11),(11,12),(7,13),(8,14),(3,15),(9,16),(12,17),(11,18),(10,19),(5,20),(7,21),(12,22)]
