-----------------------------|
 -----------------------------|
 -----------------------------|
 -----------------------------|
 -----------------------------|
 --0-0-0-0-0-0-0-0-0-0-~~~~~~-|
     ca.24x 0


 ---------------------------------|
 ---------------------------------|
 ---------------------------------|
 -(b9)----7-----7-5-4---4-5-4---5-4-|
 -(b9)----7-----7-5-4---4-5-4---5-4-|
 -7-0-0-5-0-0-5-3-2-0-2-3-2-0-3-2-|


 ----------------------------------------|
 ----------------------------8-8-8-8-8-8-|
 --5-5-5-5-5-5-5-5-5-0-0-0-0-(b9)(b9)(b9)(b9)(b9)(b9)|
 --5-5-5-5-5-5-5-5-5-(b9)(b9)(b9)(b9)(b9)(b9)(b9)(b9)(b9)(b9)|
 --3-3-3-3-3-3-3-3-3-7-7-7-7-7-7-7-7-7-7-|
 --------------------0-0-0-0-------------|