x Ascending
|--------------------------------------8-|
|------------------------------8-10-11---|
|-------------------------8-10-----------|
|-----------------8-10-12----------------|
|---------8-10-12------------------------|
|-8-10-11--------------------------------|
Descending
|--------------------------------------|
|-11-10-8------------------------------|
|---------10-8-------------------------|
|--------------12-10-8-----------------|
|----------------------12-10-8---------|
|------------------------------11-10-8-|
