-hou bbbb bblb bboy bbyo bhor bhoy bhur bhuu blob bloo blou bloy blub blur bly- bobb bobo bobu boby bohl boho bohr bohu bohy boll bolo bolu boly boob booh bool boor bor- borh boro borr boru bory bouh boul bour bouy boyl boyo brob broh brol broo bror brou brrr bruh bry- bryo bubb bubo bubu buhl buho buhr buhy bulb bull bulu buol buoy bur- burb burh burl buro burr buru bury buyl buyo buyu byob byol byul hhhh hlly hlul hobo hoby hohl hoho hol- holb holh holl holo holu holy hool hoor horl horo horr hory hour hrbl hrob hryb hubb hubl hubo huby huhu hull hulu huly huor hurl huro hurr huru hury huub huyr hybo hyl- hyll hylo hyly hyo- lblr lhhh lhor llll lloo llyr lob- lobb lobh lobo loby loho lohr lohu loll lolo loly loob lool loor loro lory louh loul lour louu lrrr lrry luby luhu lull lulu luoh lury lyly lyo- lyro obbo obby oblu obol obor oboy obrh obro obuh ohho ohly ohob ohoh ohyo olbo olby ollo olly olor olry olur ooby ooho oolo oooh oooo oory orbb orbo orbu orby orlo orlu orly oro- oror oroy orro orry orub oulu our- ouro ouu- ouyr oyly oyou rbbb rbbr rboh rhob rhoh rhyl rob- robb robo robu roby rohl rohr rohu rohy roll rolo roly roob rool roor roro roru rory roub rouh roul rouy royl rrrr rubb rubu ruby ruhh ruhl ruhr rull rulo ruly ruoy ruro ruru ruyl ryhb ryob ryoh ubbo ublo ubly uhoh uhry uhuh ullo ullr ully ulo- ulul uor- urho uro- urol uroo urrh urry urur uulu uuuu ybor ybry yhou yobo yoho yoll yolo yoly yool yoro yory youb youl your yoyo yrho yrly yubu yulo yulu yury yuyu yyyy