1---2-2-1-1-------2-2-1-1-------2-2-1-1-------2-2-1-1-------
2-----------2-2-----------2-2-----------2-2-----------2-2---
3---------------3-------------3-------------3-------------3-
4-----------------------------------------------------------
5-----------------------------------------------------------
6-----------------------------------------------------------

1-----------------------------------------------------------
2---------------1-------------1---------------------------3-
3-------2-2-3-3-------2-2-3-3-------3-3-5-5-6-----3-3-5-5---
4---3-3-----------3-3-----------4-4-----------4-4-----------
5-----------------------------------------------------------
6-----------------------------------------------------------

1---2-2-1-1-------2-2-1-1-------2-2-1-1-------2-2-1-1-------
2-----------2-2-----------2-2-----------2-2-----------2-2---
3---------------3-------------3-------------3-------------3-
4-----------------------------------------------------------
5-----------------------------------------------------------
6-----------------------------------------------------------

1---------------------------------------------2-
2---------------1-------------1-------------2---
3-------2-2-3-3-------2-2-3-3-------3-3-5-5-----
4---3-3-----------3-3-----------4-4-------------
5-----------------------------------------------
6-----------------------------------------------