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The books in the Nightshade series by Andrea Cremer are: "Nightshade," "Wolfsbane," "Bloodrose," and "Rift."
Matters of the Bittersweet was created in 2007.
The Bittersweet Constrain was created in 2008.
Bittersweet Fools happened in 2000.
Bittersweet Love was created in 1976.