-hou bbbb bhor bhur bhuu bobb bobo bobu bohm boho bohr bohu boko boku bomb bomu boob booh book boom boor bor- borh bork borm boro borr boru bouh bouk boum bour brkb brob broh brok brom broo bror brou brrm brrr bruh brum bubb bubo bubu buho buhr bukh bukk buko buku bum- bumb bur- burb burh burk burm buro burr buru hhhh hkbu hkmo hmhb hmmm hobo hohm hoho hoko hoku hom- homo homr homu hook hoom hoor hork horo horr houk hour hrob hubb hubo huhu hukm humh humm humo huor hurk huro hurr huru huub kbbb kbbk kbbm kbbo kbbr kbbu kbhb kbhh kbhm kbhr kbkb kbkk kbko kbkr kbmb kbmo kbmr kbob kbok kboo kbrb kbrh kbrk kbro kbru kbub kbuk kbur kbuu khbm khbr khhk khhm khho khkk khkm khkr khmb khmo khmr khmu khob khok khom khor khou khrk khro khrr khub khuk khum khur kkbb kkbo kkbr kkhb kkhh kkhk kkhr kkkk kkmk kkmo kkmr kkob kkoh kkoo kkor kkrb kkrh kkrk kkro kkrr kkuu kmbh kmbr kmhb kmhk kmhm kmhr kmkk kmko kmmk kmmm kmmo kmmr kmob kmok kmom kmor kmou kmrb kmro kmrr kmur kobb kobk kobo kobr kobu kohh kohm koho kohr kohu kokb kokh kokk koko kokr koku komb komo komr koob kook kooo koor koou korb kork koro korr koru koub koum kour kouu krbb krbk krbm krbr krkh krkk krko krkr krku krmb krmh krmo krmr krob kroh krok krom kroo kror krrb krrk krrm krro krrr kruh kruk krum krur kubb kubo kubr kubu kuhm kuhu kukh kukk kuku kumm kumo kumr kumu kuok kuoo kurb kurk kurm kuro kurr kuru kuub kuuk kuur kuuu mbou mhmm mhmr mhor mmhm mmmh mmmm mmor mobb mobo mohm moho mohr mohu moko momo momu moob mook moor morb mork moro moru mouk mour mrbb mrbm mrkh mrkr mruk mubo muhr muhu muko mumm mumo mumu murk muro murr muru obbo obkb obok obor obrh obro obuh ohho ohob ohoh ohok ohum okko okmo okok okom okor okro okur ombo ombu omo- omoo omor omro omuo ooho ooku oooh oooo orbb orbo orbu orko ormo oro- orok orom oror orro orub orum our- ouro ouu- rbbb rbbr rbmk rboh rhob rhoh rhum rob- robb robo robu rohm rohr rohu rokh rokk roko rokr roku romb romk romm romo roob rook room roor rork roro roru roub rouh rouk roum rrkm rrrr rrum rubb rubu ruhh ruhm ruhr rukh rukk ruku rumb rumm rumo ruok ruro ruru ubbo uhoh uhok uhuh ukko ukok ukum ukur umb- umbo ummo umok umor uomo uor- urho uro- urok urom uroo urrh uruk urum urur uuuu