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15 points
COTERMINOUS is validvalid
[adj] : COTERMINOUSLY [adv]
having the same or coincident boundaries, also CONTERMINAL, CONTERMINANT, CONTERMINATE, CONTERMINOUS [adj COTERMINOUSLY]
[adj] : COTERMINOUSLY [adv]
having the same or coincident boundaries, also CONTERMINAL, CONTERMINANT, CONTERMINATE, CONTERMINOUS [adj COTERMINOUSLY]