The most important thing you have to remember is that it has only one way in. Is there no other way out? Take the police as an example. Using traditional heuristics, policemen can spot any dead volcano -- as long as it never decides to trap them in. Is there no other way out? Take the police as an example.

     In such occasion, the police usually summons three jolubons. Should you cross their path, do not miss this opportunity to make new special friends.