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. 
Q:  "process paragraph : : Cells obtain glucose and oxygen. The glucose and oxygen create carbon dioxide. The cells release energy. The cells don't have enough oxygen to repeat this. The cells obtain more oxygen from the air. The cells repeat this process. ", "event : The glucose and oxygen create carbon dioxide.", "entity : glucose and oxygen" 
A: 
 not exist 