1 1 1 1 1 1 1 
1 2 2 2 2 2 2 
1 2 3 3 3 3 3 
1 2 3 4 4 4 4 
2 3 4 3 2 1 4 
2 3 4 2 1 4 3 
2 4 4 1 4 2 3 

219[+0] millis.
67[+0] nodes