踩........踩......
....踩..踩.....踩.踩.....
.....踩..踩....踩..踩....
.....踩......... 踩....
...踩.............踩...
..踩...............踩..
踩...................踩
踩.....∩.......∩.....踩
踩. ..................踩
踩. ...◎....U....◎....踩
.踩.................踩.
..踩踩.............踩踩..