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public relations, PR | a promotion intended to create goodwill for a person or institution | ||
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Puerto Rico, PR, Porto Rico, Commonwealth of Puerto Rico | a self-governing commonwealth associated with the United States occupying the island of Puerto Rico | ||
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praseodymium, Pr, atomic number 59 | a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process |