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Wiktionary
raisin bran

n. A mixture of bran flakes and raisins eaten as a breakfast cereal.

WordNet
raisin bran

n. bran flakes with raisins

Wikipedia
Raisin Bran

Raisin bran (sultana bran in some countries) is a breakfast cereal manufactured by several companies under a variety of brand names, including Kellogg's Raisin Bran, General Mills' Total Raisin Bran and Post Foods' Post Raisin Bran.