uni-: unicycle, united, unicorn, unique, union, unison, uniform, universe, tri-: tricycle, trilogy, triangle, triple, triplet, tripod, trio, bi-: bicycle, biweekly, bisect, bilinguial, other: octopus, pentagon, octagon, October, quadrangle,

WTW- Green- Sort 51- Prefixes (uni-, bi-, tri-)

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