| CAA | Premium Custom A | Architectural, narrow heart, very limited sugar, gum, figure, and pin knots
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| CA | Custom A | Narrow heart, mild grain, some figure, sugar, gum, and pin knots
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| DA | Desk A | Mild to bold or flowery grain patterns
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| AA | AA Grade | Per HPVA 2000 Standards
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| A | A Grade | Per HPVA 2000 Standards
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| B | B Grade | Per HPVA 2000 Standards
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| 1 | #1 Back | Plain sliced or quarter sliced, matching specified per HPVA 2000 Standards
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| 2 | #2 Back | Plain sliced or quarter sliced, per HPVA 2000 Standards
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| 3 | #3 Back | Plain sliced or quarter sliced, solid per HPVA 2000 Standards (repaired if specified)
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| 4S | #4 Back | Unrepaired splits, knots, sap, and wood decay
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| 4R | #4 Back | Lowest grade backer -- reject with large open defects
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