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

|-------------------------3-5-| 
|-------------------- 3-5-6---| 
|--------------2-4-5----------| 
|---------2-3-5---------------| 
|----2-3-5--------------------| 
|-3-5-------------------------| 

|------------------------5-7-8-| 
|-------------------5-6-8------| 
|--------------4-5-7-----------| 
|-----------5-7----------------| 
|------5-7-8-------------------| 
|-5-7-8------------------------| 

|------------------------------7-8-9-| 
|-------------------------8-10-------| 
|------------------7-9-10------------| 
|-----------7-9-10-------------------| 
|------7-8-9-------------------------| 
|-7-8-9------------------------------| 

|-------------------------------7-8-| 
|--------------------------8-10-----| 
|-------------------7-9-10----------| 
|-------------7-9-10----------------| 
|------7-8-10-----------------------| 
|-8-10------------------------------| 

|----------------------------8-10-12-| 
|----------------------10-12---------| 
|---------------9-10-12--------------| 
|----------91012---------------------| 
|-----81012--------------------------| 
|1012--------------------------------|