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   ocr: A simple relational example in db File: CD Songs 1:m CD # CD # Category Song # Disc title Song title Group/artist Length Distributor Price Comments: - Key field. The field(s) within this border make a record unique. 1:m = A one-to-many relation. .e. for each CD there can be many songs This relation is implemented using three ARexx scripts in this drawer: CD-songs.an, Songs-CD.db and unique.db