Definition: In this task, you are given a paragraph, event and an entity. The event is part of the given paragraph and it changes the state of the entity. Your task is to classify the state of the entity into three classes: 1) not exist, 2) unknown location and 3) known location. "not exist" means the entity doesn't exist in that state anymore. "unknown location" means the entity exists in that state but location is unknown. "known location" means the entity exists and location is known. 
Input:  "process paragraph : : People dig up coal from the ground. People burn coal for heat or electricity. Pollution from the coal goes into the sky. Coal pollution enters clouds. Clouds rain over an area. The polluted rain becomes acid rain. ", "event : People burn coal for heat or electricity.", "entity : coal" 
Output:
 not exist 