Example (object to label: mouse): 
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Note: the polygon should closely follow the outline of the object. All the objects should be annotated individually. Do not group them with a single polygon. Do not label other objects than mouses.
Example of BAD LABELING: 
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Note: the polygons do not follow the shape of the objects. There are many objects labeled, and not just mouses as requested.
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       The following steps describe how to label an object: 
 Some additional guidelines: 
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