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