bbbb bbeb bbet bbrc bcbc bccc bcec bcer bcet bcor bcru bctc bcuc bebb bebe bebo becu beeb beer beet beo- beor beot berc bere bero berr bert beru betc bete beto bett betu beur bobb bobe bobo bobu boce boco bocu boec boee boeo boer boet boob booc booe boor boot bor- bore boro borr bort boru botb bote boto bott boue bour bout brcb brce breb brec bree breo brer bret brob broc broe broo bror brot brou brrr brtc bruc brue brut btcc btec btob btor btrc btrt bttb bubb bube bubo bubu bucc buce buco bucu buer bueu bur- burb bure buro burr burt buru but- bute buto butt c-bo cbbc cbcc cbce cbcr cbct cbcu cbec cbee cber cbet cbot cbre cbrt cbtc ccbc cccb cccc cccu ccee ccob ccoc ccrc ccre ccrt cctb cctc cctt ccuc ccut cebu cec- cece ceco cect ceeb ceec ceor ceou cer- cerc cere cero cert cet- cete ceto cobb cobe cobo cobu coce coco coct cocu coob coot cor- corb corc core coro corr cort cotb cotc cote coto cott cotu coub coue cour cout crbc crbu crcc crce crcr cre- creb crec cree creo cret creu crob croc croe croo cror crot crrt crtc crub crue crut ctec ctor ctot ctrc cub- cubb cube cucc cuce cuer curb cure curo curr curt cut- cutc cute cuto cutt ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ebru ebur ecbc ecbe eccb eccc ecce ecco ecct eco- ecot ecou ecrc ecrr ecru ect- ectc ecto eeee eeoc eerc eero eetc eete eetu eore eotc eoto erbb erbe ercc erce ereb erec erer eret erob eroc eroe eroo errc erre erro ertu erub eruc erur etbc etbr etcc etco etec etee eter etoe etre etro ette etto ettu eubc euer eur- eurc eure euro eurt o-eo obbo obec ober obet oboe obor obot obre obro ocbc occc occt oce ocee ocet ocre ocro ocrr oct- octe octo ocur oec- oecc oeec oere oobe oocr ooer oooo oore oort ootb orbb orbe orbo orbu orce orco ore- oreb orec oreo orer oro- oroe oror orot orro ortc orte orto orub otee oter oto- otoe otoo otor otre otro otte otto ottu otur oucc ouer our- oure ouro ourt out- outb oute outo ouu- rbbb rbbr rcbc rcbo rccb rccc rcet rctc rebb rebe rebo rebu recc rece recr rect recu reeb reet reot reou rere rero rert reru rete reto retr rett reue reut reuu rob- robb robe robo robt robu rocc roce roco roer roet roob roor root rorc rore roro rort roru rotc rote roto rotr rott roub roue rout rrrr rtcc rtce rtee rubb rube rubu ruce ruct ruer ruet rurc rure ruro ruru rute ruto rutt rutu tbcb tbcc tbce tbrb tccc tccu tctc tebo tebu teco tecr tect teec teer teet teor ter- terc tere tero terr teru tete teto tetr tett tetu teut tobe tobo tobt tobu toce toco toee toer toet toor toot torc tore toro torr tort toru totc tote toto totr tott tour tout trcc tre- trec tree treo tret treu troc troe troo trot trou trtc trte trtr trub truc true trut truu ttbb tteo tter ttoe tttt tubb tube tubo tubr tubu tucc tuco tuer tuet tuor turb turc ture turo turr turt turu tute tuto tutt tutu tuuo ubbe ubbo uber ubet uboc ucbc ucrc ucut uocc uor- uore urbe ure- uret uro- uroo urre urte urur urut utec uter utor utto uttu uuoc uuuu