You will be given a definition of a task first, then some input of the task.
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 : : To bake a cake you first need to gather your ingredients. Preheat the oven to desired baking temperature. Grease your preferred cake pan with crisco or butter or other non-stick spray. Add eggs and vegetable oil to the dry ingredients. Stir or whisk until all the dry flour has been absorbed. Pour the batter into the greased cake pan. Place cake pan into the oven for the required time. When a toothpick inserted into the cake comes out clean, the cake is done baking. ", "event : Preheat the oven to desired baking temperature.", "entity : ingredients" 
Output:
 unknown location 