The oldest of the four classifications is the general classification. This classification was calculated as a combination of the other classifications. The points classification is the third oldest of the currently awarded jersey classifications. Nested hierarchies are the organizational schemes behind taxonomies and systematic classifications. Several organizations seek to identify trends in order to produce country classifications. The expenditure classifications used there may however be different. Other classifications distinguish between Southwest and Northwest. There are other properties of orbits that allow for different classifications. Their system has been used as the basis of subsequent classifications. There are many different classifications of marketing. Indiana allows highways of different classifications to have the same number. Some examples of problematic classifications follow. However, there are some different classifications. They are learning machines that are used to perform binary classifications and regression estimations. There are legal implications to all of the classifications.