omim omio omo- omoi omoo omor omri omro omul omuo oobi oocr oodi ooid oold oolo oooo oord orbb orbi orbo orbu orci orco ordo ordu ori- oric orid oril orio orlo orlu ormo oro- orom oror orri orro orub orum oucc oudc ouii ouir ould oulu oumi our- ouro ouu- rbbb rbbr rbcl rcbc rcbo rccb rccc rcdc rcic rcid rcrd rdbm rdcm rdio rdoc rib- ribo ribu ricc rico ridc ridd ridi rido rill rilo rilu rimi rimm rimo rimu riol riom riou riri rlml rmll rob- robb robi robo robu rocc roco rodd rodi rodo roid roil roio roir roiu rold roll rolm rolo romb romd romi romm romo roob rood rooi rool room roor rorc rori roro roru roub roud roul roum rrmc rrrr rrum rubb rubi rubu ruci rudd rudi rudl rudo ruid rull rulo rumb rumi ruml rumm rumo rurc rurd ruri ruro ruru ruud ubbi ubbo ubic ubid ubii ubir ubli ublo uboc ubod ubud ucbc ucci ucdc ucdd ucil ucio ucmc ucom ucrc udbc uddi udic udid udim udir udmc udoo uiml uirr ulbc ulcc ulco ulic ulim ulli ullo ullr ulmi ulmo ulmu ulo- uloc ulul ulum umb- umbi umbo ummo umol umor umri uocc uolc uoml uomo uor- urbi urci urdu urib uric urim uriu urmi uro- urol urom uroo urri urum urur uulu uuoc uuri uuuu