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Softwoods are split into two categories and graded according to the American Softwood Lumber Standard. Dimensional, or "construction," lumber is graded on strength, while "appearance" and remanufacture lumber—boards that provide the raw material for other products—are graded on looks. The two primary grades are Finish followed by Select, each with letters A, B, C, and D as subgrades. The further down the alphabet, the more defects.
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