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ACROSS
1)  the option to sell a given stock (or stock index or commodity future) at a given price before a given date
2)  a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood
3)  a republic in western south america; achieved independence from spain in 1821; was the heart of the inca empire from the 12th to 16th centuries
4)  north american woodland herb similar to and used as substitute for the chinese ginseng


DOWN
1)  a disease of poultry
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)  separate or cause to separate abruptly
4)  a small secluded room

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