I think this is the correct intro. Enjoy.
-x--------------------------------------------|
-x--------------------------------------------|
-x--------------------------------------------|
-x--10---9--ring------------------------------|
-x--12--10------------------------------------|
-x--------------------------------------------|
---------------------------------------------------------------------------|
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---7---12-12--7-7-10-10-5-5---7--3-3-3--7-3-3-3--5-5-5--7-3-3-3------------|
---7---12-12--7-7-10-10-5-5---7--3-3-3--7-3-3-3--5-5-5--7-3-3-3------------|
---7---12-12--7-7-10-10-5-5---7--3-3-3--7-3-3-3--5-5-5--7-3-3-3------------|
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-3--2-2-2--x--3----------------------------------|
-5--3-3-3--x--2-ring-----------------------------|
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------------------I-----------------------------------------|
------------------I-----------------------------------------|
------2-------2---I-x---------------------------------------|
--3-2-2---3-2-2---I-x--3-2-ring-----------------------------|
--3-2-0---3-2-0---I-x--5-3----------------------------------|
--3-2-----3-2-----I-x---------------------------------------|