instruction:
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. 
question:
 "process paragraph : : Bats and other animals produce a high-pitched tone. The sound travels in waves, as sound does. The sound "bounces" off of a nearby object. The sound wave returns to the bat. The bat hears the echoed sound. Folds in the bat's ear and adaptations in the bat's brain enable it to determine the size, shape, and position of the other object via the properties of the returned sound waves. Other animals use echolocation in generally similar ways. ", "event : The sound travels in waves, as sound does.", "entity : high-pitched tone ; sound ; sound wave ; echoed sound" 
answer:
 unknown location 


question:
 "process paragraph : : An airline reservation is made. The passenger arrives early at the airport. The luggage is checked. The passenger waits in line. The passenger shows their identification and gets a boarding pass. The passenger goes to their gate. The passenger gets in line when it's time to board. The person boards the plane. The plane arrives at the destination. The passenger gets off the plane at their destination. ", "event : The passenger arrives early at the airport.", "entity : plane" 
answer:
 unknown location 


question:
 "process paragraph : : Hydrogen atoms in a star combine together to form helium atoms. All of the hydrogen in a star turns into helium. The star begins to collapse. Helium atoms combine together to form carbon atoms. The star gets much bigger than it was before. The star is now a red giant. ", "event : All of the hydrogen in a star turns into helium.", "entity : hydrogen atoms" 
answer:

 not exist