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Each CUSTOMER places zero or more ORDER (S) ; each ORDER is placed by one CUSTOMER .
Each ORDER sells as one or more ORDERED ITEM (S) ; each ORDERED ITEM is contained in the ORDER .
Each ORDERED ITEM is sold as one or more STOCK (S) ; each ORDERED ITEM is contained in the STOCK .
Each STOCK is featured to have zero or more PROMOTION TITLE (S) ; each PROMOTION TITLE is featured to only one STOCK .
Each PROMOTION features one or more PROMOTION TITLE (S) ; each PROMOTION TITLE is referenced in one PROMOTION .
Each CUSTOMER may generate one or more INVOICE (S) ; each INVOICE is generated by one CUSOMTER .
Each INVOICE may contain one or more INVOICE LINE (S) ; each INVOICE LINE is contained in one invoice .
Each INVOICE LINE references one STOCK ; each STOCK may be referenced in one or more INVOICE LINE (S).
Each SALE contains one or more INVOICE LINE (S) ; each INVOICE LINE is contained in one SALE.
Each EMPLOYEE performs one or more SALE (S) ; each SALE is performed by only one EMPLOYEE .
Each SUPPLIER is involved in more than one STOCK (S) SUPPLIED ; each STOCK SUPPLIED involves one SUPPLIER .
Each STOCK SUPPLIED references more than one STOCK (S) ; each STOCK references to one STOCK SUPPLIED.
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