1--------------------------------------------
2--------------------3-2-----2-1--1-1--------
3---------2-3----2-3-----2-3----------3------
4-0-3-4-5-----4-5-----------------------3-5-5
1---------2-0--------------------------------
2-------------2-----0-1-1-1-1/0--------------
3---------------0-3-------------3------------
4-0-3-4-5-------------------------3-5-5------