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Heat oven to 350°F. In large bowl, break up cookie dough; stir in flour until well mixed. In medium bowl, place half of the dough; add desired amount of green food coloring, working it into dough until well blended, Wrap dough in plastic wrap; freeze 10 minutes. In separate medium bowl, place remaining dough; add desired amount of red food coloring, working it into dough until well blended. Wrap dough in plastic wrap; freeze 10 minutes.