|--------------------------------------------------|
|---0-1-2-2-2-0-----0-1-2-2-2-0----0-1-2-2-2-0-----|
|-2-------------2-2-------------2--------------2-2-|
|--------------------------------------------------|

|-----------------0-1-2-2-2-0-----0-1-2-2-2-0---|
|-0-1-2-2-2-0---2-------------2-2-------------2-|
|-------------2---------------------------------|
|-----------------------------------------------|

|-----------------------------------2-3-4-4-4-2-0-|
|---0-1-2-2-2-0-----0-1-2-2-2-0---4---------------|
|-2-------------2-2-------------2-----------------|
|-------------------------------------------------|

|-----0-1-2-2-2-0---------------------------|
|-4-2-------------2---0-1-2-----------------|    repeat
|-------------------2-------2-2-2-2-2-2-2-2-|
|-------------------------------------------|