1 ---3-3------3-5-3----------------------------------5-3--
2 --------5-6-------6-5---5-5-----5-6-5-------------------
3 ----------------------7-----5-7------7-5-4-2-2-2-5------
1 --------------------------------------------------------
2 ----3-5-6-5-----5-6-5--3-1------------------------------
3 -5-----------5-----------------------------------------