---8---------8--9--8---------8--9--8--------------8-9-8---------------------|
------9---------------9---------------9---------9--------9------------------|
---------8---------------8---------------8---8--------------8---------------|
----------------------------------------------------------------------------|
----------------------------------------------------------------------------|
----------------------------------------------------------------------------|
---8---------8--9--8---------8--9--8--------------8-9-8---------------------|
------9---------------9---------------9---------9--------9------------------|
---------8---------------8---------------8---8--------------8---------------|
----------------------------------------------------------------------------|
----------------------------------------------------------------------------|
----------------------------------------------------------------------------|
