Question: The co-writer of the song "Firework" also wrote which song by singer Chris Brown?
Sentence (from "Ester Dean"): Dean has also co-written songs for many artists including Christina Aguilera, Florence + The Machine, Katy Perry, Beyoncé, Nicole Scherzinger, Priyanka Chopra, Mary J. Blige, Nicki Minaj, Kelly Clarkson, Ciara, The Pussycat Dolls, Usher, Kelly Rowland, Girlicious, Keri Hilson, Rihanna, R. Kelly, Britney Spears, Melody Thornton, Vanessa White, Kevin McHale, Selena Gomez, G.R.L., Soulja Boy Tell 'Em, Little Mix, Pia Toscano, Tinie Tempah, Lil Wayne, Machine Gun Kelly, Fifth Harmony, and Eurovision Song Contest 2012 winner Loreen.
Relevant evidence: No