----------------- | | | | | (| | o 0 0 | 0 | o 0|) | | | | | (| 0 | 0 | 0 | 0 |) | | b | | | | (| 0 | 0 | 0 | 0 |) | | | | | (| 0| 0 | 0 | 0 | ) ============================ exterminate!