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 : : A photovoltaic cell is created with two layers of semiconductor material. The top layer are "doped" with impurities to allow a negative charge. The bottom layer are "doped" to allow for a positive charge. This produces an electric field that allows electrons to flow from negative to positve. Sunlight enters the cell. Energy from sunlight knocks electrons loose in both fields. This prevents the flow of electrons from negative to positive. Adding an external circuit allows the exchange to continue. Give the cells owner a flow of electricity. ", "event : The top layer are "doped" with impurities to allow a negative charge.", "entity : photovoltaic cell" 

SOLUTION:  unknown location 

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 

PROBLEM:  "process paragraph : : A flowering plant has stamen and pistils. An insect ot bird lands on the plant. Some of the pollen sticks to it. The insect or bird travels to another plant of the same species. The pollen is tranferred to the new plant. ", "event : An insect ot bird lands on the plant.", "entity : stamen and pistils" 

SOLUTION:
 known location 

