-hou bbbb bbch bbrc bcbc bccc bcor bcru bcuc bhcc bhor bhur bhuu bobb bobo bobu boch bock boco bocu boho bohr bohu boko boku boob booc booh book boor bor- borh bork boro borr boru bouh bouk bour brcb brkb brob broc broh brok broo bror brou brrr bruc bruh bubb bubo bubu bucc buch buck buco bucu buho buhr bukh bukk buko buku bur- burb burh burk buro burr buru c-bo cbbc cbcc cbcr cbcu cbko cbkr cbrh ccbc cccb cccc cccu cchr ccob ccoc ccrc ccuc chch chkb choc choh chok choo chor chou chrb chrc chro chrr chub chuk chur ckbc ckch ckck ckco ckob ckoc ckoo ckor ckrc cobb cobh cobo cobu coch cock coco cocu coho cok- coko coob cooh cook cor- corb corc cork coro corr coub couk cour crbc crbu crcc crcr crkc crob croc croh crok croo cror crub cruk cub- cubb cucc cuck cuk- curb curo curr hboc hcbc hccb hccc hcch hhhh hkbu hkcc hobo hoch hock hocr hoho hoko hoku hook hoor horc hork horo horr houk hour hrob hrrc hubb hubo huch huck hucu huhu huor hurk huro hurr huru huub kbbb kbbc kbbk kbbo kbbr kbbu kbcb kbch kbck kbco kbcr kbcu kbhb kbhc kbhh kbhr kbkb kbkk kbko kbkr kbob kboc kbok kboo kbrb kbrc kbrh kbrk kbro kbru kbub kbuc kbuk kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kchh kchk kcho kchr kchu kckc kckk kcko kckr kcob kcoh kcor kcou kcrc kcrh kcro kcrr kcru kcub kcuh kcuk khbc khbr khcb khcc khch khck khhk khho khkk khkr khob khoc khok khor khou khrk khro khrr khub khuk khur kkbb kkbo kkbr kkcb kkch kkck kkco kkcr kkhb kkhh kkhk kkhr kkkk kkob kkoh kkoo kkor kkrb kkrc kkrh kkrk kkro kkrr kkuu kobb kobc kobk kobo kobr kobu kocb koch kock kohh koho kohr kohu kokb kokc kokh kokk koko kokr koku koob kooc kook kooo koor koou korb korc kork koro korr koru koub kour kouu krbb krbk krbr krcb krcc krch krco krcu krhc krkc krkh krkk krko krkr krku krob kroc kroh krok kroo kror krrb krrc krrk krro krrr kruc kruh kruk krur kubb kubc kubo kubr kubu kucb kucc kuch kuco kucr kuhu kukh kukk kuku kuok kuoo kurb kurk kuro kurr kuru kuub kuuk kuur kuuu obbo obkb obok obor obrh obro obuh ocbc occc ocro ocrr ocur ohcc ohho ohob ohoh ohok okcu okko okok okor okro okur oocr ooho ooku oooh oooo orbb orbo orbu orch orco orko oro- orok oror orro orub oucc ouch our- ouro ouu- rbbb rbbr rboh rcbc rcbo rccb rccc rchb rhob rhoc rhoh rob- robb robo robu rocc roch rock roco rohr rohu rokh rokk roko rokr roku roob rook roor rorc rork roro roru roub rouh rouk rrrr rubb rubu ruch ruck ruhh ruhr rukh rukk ruku ruok rurc ruro ruru ubbo uboc ucbc ucho ucrc uhoh uhok uhuh ukcc ukko ukok ukrc ukur uocc uor- urch urho uro- urok uroo urrh uruk urur uuoc uuuu