TASK 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. 
PROBLEM:  "process paragraph : : An area is at a higher elevation than the surrounding area. Rain falls. Water is in the area of high elevation. The water creates a stream. The stream moves towards lower elevation. The stream continues along the same path for a long time. The soil and rocks erode where the stream touches them. The stream moves deeper into the soil. The stream is smaller than the eroded area. ", "event : Rain falls.", "entity : rain" 

SOLUTION:  not exist 

PROBLEM:  "process paragraph : : Carbon dioxide enters the leaf through the stomates. Water is absorbed by the plant and transported to the leaves. Sunlight is captured by the plant. Energy in the form of ATP is made from the sun's energy. Carbon dioxide, water, and ATP form sugars via the Calvin cycle. Oxygen is given off as a byproduct. Oxygen leaves the leaf through the stomates. Water is reused or it leaves the leaf. The sugars can be used by the plant to make cellulose. ", "event : Water is absorbed by the plant and transported to the leaves.", "entity : atp" 

SOLUTION:  not exist 

PROBLEM:  "process paragraph : : Air is drawn in through the mouth. The air goes down the esophagus. The air moves into the lungs. The carbon dioxide is removed. The remaining oxygen enters the body. The remaining carbon dioxide is expelled through the mouth. ", "event : The air goes down the esophagus.", "entity : air" 

SOLUTION:
 known location