[liyicong]

o o
\ /
\ /
\ /
\ /
______\/_______ _____
| _________ | | --|
| | ^ ^ | ()| |---|
| | o o | ()| |---|
| | || | | |---|
| | - - | _ | |- |
| | |____| ||_|| | |
| |_________| | | |
|_______________| |___|