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Preheat oven to 350°.
In a large bowl, combine blackberries with granulated sugar, 1 tablespoon of flour and orange juice.
Transfer to a 1 1/2-quart ovenproof casserole.
In another bowl, combine oats, pecans, brown sugar, the remaining 2 tablespoons flour and cinnamon. Drizzle with oil and stir to combine.
Sprinkle oat mixture over fruit.
Bake until fruit is bubbling and topping is golden, about 15 to 20 minutes. Let stand for at least 10 minutes before serving.