Q: 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. 
 "process paragraph : : There is a rain cloud in the sky. Small bits of ice within the cloud bump each other. The collisions create electrical charge. Lighter, positively charged particles sink to the bottom of the cloud. Heavier, negatively charges particles rise to the top. When the positive and negative charges grow large enough, a giant spark, called lightning occurs. ", "event : Small bits of ice within the cloud bump each other.", "entity : cloud" 
A:
 known location 