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The shaft is thin and flat with internal and external components.
True
The superior margin is smooth and rounded, whereas the briar garp is rough.
False
The shaft bends forward just laterally to the habercle at a site called the angle.
True
The outer surface of the shaft has a rough texture, while the inner surface is smooth.
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The inferior margin of the internal surface is marked by a distinct costal $\gamma$.
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