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The join of the projections of BadAlbum is equal to BadAlbum. BadAlbum == join( project(BadAlbum, [artist, artist_website]), project(BadAlbum, [artist, title, year, label, label_website]))
BadAlbum == join( project(BadAlbum, [artist, artist_website]), project(BadAlbum, [artist, title, year, label, label_website]))