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Singular  Plural    Singular  Plural 
bamboo bamboos   ratio ratios
casino casinos   scenario scenarios
commando commandos   silo silos
disco discos   shampoo shampoos
duo duos   solo solos
dynamo dynamos   stereo stereos
ghetto ghettos   studio studios
kangaroo kangaroos   tattoo tattoos
kilo kilos   trio trios
photo photos   video videos
piano pianos   zero zeros
radio radios   zoo zoos