Draw a complete ER diagram for these three entities and the relationships between them.

An ITEM is supplied by one SUPPLIER, a SUPPLIER can supply multiple ITEMs. Some ITEMs are created by the store, and don't have a SUPPLIER.

A STORE sells many ITEMs. An ITEM could be sold at many STOREs.

A STORE can recieve from multiple SUPPLIERs. Each SUPPLIER can provide for multiple STOREs.