-hou bbbb bbch bbrc bcbc bccc bcnu bcor bcru bcuc bhcc bhor bhur bhuu bnoc bnor bnrr bobb bobo bobu boch boco bocu bohn boho bohr bohu bonc bonn bono bonu boob booc booh boon boor bor- borh born boro borr boru bouh boun bour brcb brno brob broc broh bron broo bror brou brrr bruc bruh brun bubb bubo bubu bucc buch buco bucu buho buhr bunb bunn buno bunu buon bur- burb burh burn buro burr buru c-bo cbbc cbcc cbcn cbcr cbcu cbrh cbrn ccbc ccbn cccb cccc cccu cchr ccnb ccnc ccnr ccnu ccob ccoc ccrc ccuc chch chnb chnc chno chnr choc choh chon choo chor chou chrb chrc chrn chro chrr chub chun chur cnbc cnco cnoh cnrc cnrr cobb cobh cobo cobu coch coco cocu cohn coho con- conc conn cono coob cooh coon cor- corb corc corn coro corr coub coun cour crbc crbu crcc crcr crob croc croh cron croo cror crub crun cub- cubb cucc cucn cuno cuon curb curn curo curr hboc hcbc hccb hccc hcch hhhh hobo hoch hocn hocr hohn hoho hono honu hoon hoor horc horn horo horr hour hrob hron hrrc hrun hubb hubo huch hucu huhn huhu hunc hunh huon huor hurn huro hurr huru huub nbbc nbbo nbcc nbco ncbc nccc nccn nccr nccu nchc ncnc ncoc ncor ncrc nhcc nhnn nhon nhrc nnnn nobc nobo nobu noch noco nohn noho non- nonn nono nonu noo- noob noon nooo noor nor- norb norc norn noro norr nouh noun nour nroc nron nrrc nubc nuch nucu nunc nunn nuno nuoc nuon nurc nurn nurr nuru obbo obon obor obrh obro obuh ocbc occc occn ocon ocro ocrr ocur ohcc ohho ohno ohob ohoh ohrn onc- onco onno onon onor onur oocr ooho oooh oooo orbb orbo orbu orch orco ornc orno oro- oron oror orro orub oucc ouch oun- our- ourn ouro ouu- rbbb rbbr rboh rcbc rcbo rccb rccc rchb rcnr rcon rhob rhoc rhoh rhon rhun rnbr rnco rob- robb robo robu rocc roch roco rohn rohr rohu ronc rono roob roon roor rorc roro roru roub rouh roun rrrr rrun rubb rubu ruch ruhh ruhn ruhr runc runn runo rurc ruro ruru ruun ubbo uboc ubon ucbc ucho ucon ucrc uhno uhoh uhuh uncc unch unco unno unon unro uocc uor- urch urho uro- uroo urrh urun urur uuno uuoc uuuu