1  2  3  4

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4  _  _  _  _


ACROSS
1)  the option to sell a given stock (or stock index or commodity future) at a given price before a given date
2)  chocolate cookie with white cream filling
3)  something left after other parts have been taken away
4)  a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite


DOWN
1)  a place (sea____ or air____) where people and merchandise can enter or leave a country
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold
4)  a chronic drinker

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