ongu onne onno onon onor onue onur oobe ooer ooho ooku oone oooh oooo oore orbb orbe orbo orbu ore- oreb oreg oreh orek oren oreo orer orge orgn orgo orhe orke orko orne orno oro- oroe orok oron oror orro orub ouen ouer ouge ough oun- oune oung our- oure ourn ouro ouu- rbbb rbbr rbgh rboh rebb rebe rebk rebo rebu reeb reek reen rege regn rego regr regu rehb rehe rehn reke reko rene reng renk renn reno renu reog reou rere rerg rero reru reue reuk reuu rgbe rhbg rheb rhee rhen rheo rhob rhog rhoh rhon rhue rhug rhun rnbr rob- robb robe robo robu roeg roen roer roge rogg rogh rogo rohe rohn rohr rohu roke rokh rokk roko rokr roku rone rong ronk rono roob roog rook roon roor rore rork roro roru roub roue rouh rouk roun rrrr rrun rubb rube rubu ruen ruer ruge rugg rugh ruhe ruhh ruhn ruhr ruke rukh rukk rukn ruku rune rung runk runn runo ruok rure ruro ruru ruun ubbe ubbo ubek uber ubon ueno ugeo uggo ughe ugne ugro ugur uguu uher uhno uhoh uhok uhuh ukek ukeu ukko ukok ukon ukur unbe uneb unee unen uner ungo ungu unke unkn unko unne unno unon unro uoke uone uor- uore urbe ure- ureh urge urgh urgu urho urke urne uro- urok uroo urre urrh uruk urun urur uuen uuno uuuu