Assertion: cotton's fiber | /r/HasProperty | selected for their whiteness
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Source sentences:
text: The most prestigious kind of pudong, limited to the most valiant, was, like their G-strings, made of pinayusan, a gauze-thin abaca of fibers selected for their whiteness, tie-dyed a deep scarlet in patterns as fine as embroidery, and burnished to a silky sheen.