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Heat oven to 350°F (325°F for dark or nonstick pans). Spray bottoms and sides of four 8-inch square pans with baking spray with flour. In large bowl, beat 1 cake mix, 1 cup of the water, 1/2 cup of the oil and 3 eggs with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Divide batter between 2 of the pans.