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    • D2-B30-45°
    D2-B40-45°
    45°two-way corner
    D2-B30-60°
    D2-B40-60°
    60°two-way corner
    D2-B30-90°
    D2-B40-90°
    90°two-way down
    D2-B30-90°I
    D2-B40-90°I
    90°two-way corner with intemal vertex
    D2-B30-45°
    D2-B40-45°
    45°two-way corner
    D2-B30-60°
    D2-B40-60°
    60°two-way corner