12
[[0,0],[0,1],[1,0],[1,1],[2,0],[2,1],[3,0],[3,1],[3,2],[4,0],[4,1],[4,2]]
21
[[1,2],[2,3],[3,1],[2,4],[3,4],[4,5],[4,6],[3,5],[5,6],[6,7],[6,8],[5,7],[7,8],[8,9],[8,11],[8,10],[7,10],[10,11],[11,12],[9,12],[9,11]]
2
[[10,[1,1]],[12,[1,0]]]
3
[[-15, 1, 2], [-10, 2, 1], [-12, 7, 2]]
