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A Combine is used to harvest Wheat. It needs to be powered by a BuildCraft compatible engine. It will harvest any mature wheat with in range of 21x10x21 (X-Y-Z) as well as any seeds that may drop. Wheat is automatically ejected into Buildcraft Pipes connected to the sides. Seeds are automatically ejected into Buildcraft Pipes connected to the top or bottom. Items can also be automatically placed into adjacent chests.