l/-3a5--5--------------------------------
2/--------7--7--5---5---3a7--------------
3/---------------------------------------
4/---------------------------------------
5/---------------------------------------
6/---------------------------------------
1/-3a5--5--------------------------------
2/--------7--7--5---5---------3--3a5--3--
3/---------------------2-4--------------4
4/---------------------------------------
5/---------------------------------------
6/---------------------------------------
1/---------------------------------------
2/-2-2-----------------------------------
3/-----4--4---2-2------------------------
4/----------------3--3a5-----------------
5/---------------------------------------
6/---------------------------------------
1/---------------------------------------
2/-2-2-----------------------------------
3/-----4--4---2-2-----3a5----------------
4/----------------3----------------------
5/---------------------------------------
6/---------------------------------------