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. 

Example Input:  "process paragraph : : Fuel is converted to energy when air and petrol mix. The car engine burns the mix of air and petrol. Hot gas from the burning pushes the pistons. The resulting energy powers the crankshaft. Crankshaft powers the gears. The gears make the wheels roll. ", "event : The car engine burns the mix of air and petrol.", "entity : air" 
Example Output:  not exist 

Example Input:  "process paragraph : : The inner portion of the ring is formed during rapid spring growth. The tree's growth slows as the seasons change. The ring's outer growth is more dense. The growth of the tree pushes out the bark of the tree. The tree stops growing quickly in the winter. This seasonal "pause" in growth results in distinct rings in certain tree types. ", "event : The tree's growth slows as the seasons change.", "entity : bark" 
Example Output:  known location 

Example Input:  "process paragraph : : A forest fire starts. The fire surrounds the vicinity. The animals are trapped. Those that survive have their habitat destroyed. The survivors must find a new habitat. Conflict with other animals occur. ", "event : The fire surrounds the vicinity.", "entity : forest fire" 
Example Output:
 known location