4:------------------------------
3:------------------------------
2:-0-0--3-5-6--7----------------
1:------------------------------

4:------------------------------
3:------------------------------
2:-0-0--3-7-6--5----------------
1:------------------------------

4:------------------------------
3:------------------------------
2:-0-0--3-5-6--7----------------
1:------------------------------

4:------------------------------
3:------------------------------
2:-0-0--3-7-6--5----------------
1:------------------------------

pretty much keep repeating....