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Noun mo has 2 senses
molybdenum, Mo, atomic number 42 - a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel--1 is a kind of metallic element, metal
 --1 is a substance of molybdenite
 
Missouri, Show Me State, MO - a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union--2 is a kind of American state
 --2 is a part of Midwest, Middle West
 --2 is a member of 
--2 has parts:
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