Entity Relationship diagram interpretations of a inventory database

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This is a Entity relationship diagram of Inventory database. ER Diagram How we can interpret it? my idea is like there is list of product with Dealer, customer orders the product. supplier supplies it. customer purchases it. But i think i'm not able to perfectly interpret it. what does the above ER diagram shows.

entity-relationship database-design sql database
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This diagram says that "products" are "purchased" from "suppliers" and "ordered" by customers (which are only named in the orders table and do not have a separate entity).

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