Some of these are home matches and some are away matches. Matches always involve two teams one playing away and one at home. Teams belong to a variety of leagues each of which is subdivided into divisions. A team may only belong to one league and one division of the league. A company maintains purchase order information.
Customers place a number of orders.
An order can only arise from a single customer. An order can be for a number of parts. Parts can appear on many orders. Parts are stored in various warehouses. Some parts are stored in more than one warehouse.