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 : : Two large veins bring blood to the heart. The blood enters the right atrium. The blood flows through the tricuspid valve. The blood travels into the right ventricle. The blood goes through the pulmonary arteries to the lungs. Blood picks up oxygen in the lungs. Oxygenated blood enters the left atrium. Blood goes to the left ventricle. Blood leaves the heart via the aorta to the rest of the body. The deoxygenated blood returns to the heart. ", "event : The blood enters the right atrium.", "entity : oxygenated blood" 
Example Output:  not exist 

Example Input:  "process paragraph : : Water is introduced to carbon dioxide. The water becomes acidic. The water seeps down to a mineral based material. The acidity of the water carves and shapes the rock. And may form geological phenomenon. ", "event : The water becomes acidic.", "entity : water" 
Example Output:  unknown location 

Example Input:  "process paragraph : : The nuclei of some atoms have too few or too many neutrons. The atoms become unstable. The atoms split. In alpha decay, two protons and two neutrons are released from the atom. In beta decay, a neutron changes into a proton and an electron. The proton joins the nucleus of the atom. The electron is released. ", "event : The atoms become unstable.", "entity : atoms" 
Example Output:
 unknown location