9                 +-+  
8                /   \
7               +-----+  
6               |     |  
5   /\          |     |  
4  +-+          |     |  
3  | |   +-+   _|_____|  
2 \| |   | | |/        \  
1  \ |   | | /          \ 
0   +-------+            +  
01234567890123456789012345
