回复：I construct for you. I learned from BUYI.using "o",

来源: 于 2011-08-09 16:27:21 [旧帖] [给我悄悄话] 本文已被阅读：次

            o1

         o2     o3    connecting o1 and o6  , one o7 is near o1 1unit,o8 is near o6 1unit

         o4     o5

            o6