d-dot ddddd do-do doddy dodoo dokdo dokuo doodo doody dooku dooky dooty doout dotoo dotto dotty dotyk douyu doyou du-ku duddo duddy dudok dudou duduk dukku dukot dutty dyott ko-ko kodok kokko kokot kokou kokut kokyu kooky kotto kottu koudo kouto kouty koyuk kudou kukko kukok kuoyu kuttu kutty kuyto kyodo kyoko kyoto kyudo odudu okoyo okuku ooooo otoku ototo otuyo outdo outto oyoko to-do toddy todok tokdo tokko toko- tokod tokuo tokyo tokyu toto- totok totoo totty toyou ttttt tudou tudyk tuotu tutku tutoy tutto tutty ukodo ututo uuuuu y-o-u ydout yo-yo yokoo yokou yotto youdo youdu youku youok yukky yukou