|------------------------------------10-12-13-|-12-10----------------------------------|
|----------------------------10-12-13---------|-------13-12-10-------------------------|
|---------------------9-10-12-----------------|----------------12-10-9-----------------|
|--------------9-10-12------------------------|------------------------12-10-9---------|
|-------8-10-12-------------------------------|--------------------------------12-10-8-|
|8-10-12--------------------------------------|----------------------------------------|