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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