First, start with this..
|---------------------------------------------------------------------|
|---------------------------------------------------------------------|
|---9----9--7----9--------------9----7--------------------------------|
|---9----9--7----9--------------9----7--------------------------------|
|---------------------9-~-11------------------------------------------|
|---------------------------------------------------------------------|
x6
Then this..
|---------------------------------------------------------------------|
|---------------------------------------------------------------------|
|---------------------------------------------------------------------|
|---9----7----5----4--------------------------------------------------|
|---7----5----3----2--------------------------------------------------|
|---------------------------------------------------------------------|