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 : : Baby rabbits are born alive. Rabbits are (only occasionally) nursed by their mothers. Many of the babies do not survive. Larger and stronger rabbit do manage to survive. Rabbits quickly become able to have babies of their own. The rabbit lifecycle continues. The amount of rabbits stays reasonable because of predators and low survival rates for their young. ", "event : Rabbits are (only occasionally) nursed by their mothers.", "entity : rabbits" 

SOLUTION:  unknown location 

PROBLEM:  "process paragraph : : Nitrogen-fixing bacteria convert atmospheric nitrogen to organic nitrogen. Plants absorb organic nitrogen from the soil through their roots. Animals eat the plants. Plants and animals die. Animals expel wastes. Fungi convert organic nitrogen to ammonium. Nitrifying bacteria convert ammonium to nitrate. Bacteria convert nitrate to nitrogen gas. Nitrogen gas escapes from soil into the atmosphere. ", "event : Plants absorb organic nitrogen from the soil through their roots.", "entity : atmospheric nitrogen" 

SOLUTION:  not exist 

PROBLEM:  "process paragraph : : You inhale air through your nose and mouth. The air travels down into your lungs. Oxygen from the air goes into your bloodstream. Oxygen circulates throughout the body due to the heart's pumping. Carbon dioxide travels from the blood into the lungs. Carbon dioxide travels from the lungs up the windpipe. Carbon dioxide is exhaled. ", "event : The air travels down into your lungs.", "entity : air" 

SOLUTION:
 known location