x----------------------|x2
x----------------------|
x----------------------|
x4---4----43---8------|
x--6--6-6--------------|
x----------------------|
x-----------------------------|
x-----------------------------|
x-----------------------------|
x-4---4------4/3--4---4-----8-|
x---6---6--6--------6--6-6----|
x-----------------------------|
x-----------------------------|
x-----------------------------|
x-----------------------------|
x-4---4------4/3--4---4-----8-|
x---6---6--6--------6--6-6----|
x-----------------------------|
x-----------------------------|
x-----------------------------|
x-----------------------------|
x-4---4------4/3--4---4-----8-|
x---6---6--6--------6--6-6----|
x-----------------------------|