bbbb bbeb bbet bbfc bbrc bcbc bccc bcec bcer bcet bcfc bcof bcor bcru bctc bcuc bebb bebe bebo becu beeb beef beer beet befe beff befo beft beo- beof beor beot berc bere bero berr bert beru betc bete beto bett betu beur bftt bobb bobe bobo bobu boce boco bocu boec boee boef boeo boer boet bofe boff bofu boob booc booe boof boor boot bor- bore borf boro borr bort boru botb bote boto bott boue bouf bour bout brcb brce breb brec bree bref breo brer bret brfc brfu brob broc broe broo bror brot brou brrr brtc bruc brue brut btcc btec btfc btob btor btrc btrt bttb bubb bube bubo bubu bucc buce buco bucu buer bueu bufc bufe buff bufo bufr bur- burb bure buro burr burt buru but- bute buto butt c-bo cbbc cbcc cbce cbcr cbct cbcu cbec cbee cbef cber cbet cbfb cbfc cbot cbre cbrt cbtc cbtf ccbc cccb cccc cccf cccu ccee ccfc ccff ccob ccoc ccrc ccre ccrf ccrt cctb cctc cctt ccuc ccut cebu cec- cece ceco cect ceeb ceec cef- cefc ceor ceou cer- cerc cere cerf cero cert cet- cete ceto cfbc cfbr cfbt cfcb cfcf cfco cffb cffr cfor cfrb cfre cfrt cftc cfte cftr cobb cobe cobo cobu coce coco coct cocu cofc cofe coff coft coob coof coot cor- corb corc core corf 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 crfc crob croc croe croo cror crot crrt crtc crtf crub crue crut ctcf ctec ctfc ctfo ctor ctot ctrc cub- cubb cube cucc cuce cuer cufc cuff cufo curb cure curf curo curr curt cut- cutc cute cuto cutt ebbc ebbo ebbr ebcc eber ebfc eboe eboo ebor ebro ebru ebur ecbc ecbe eccb eccc ecce ecco ecct ecef ecfc ecfr eco- ecot ecou ecrc ecrf ecrr ecru ect- ectc ectf ecto eeee eefe eeoc eerc eero eetc eete eetu efbr efco efeo efet efor eft- eftu eore eotc eoto erbb erbe ercc erce ereb erec erer eret erfc erft erob eroc eroe eroo errc erre erro ertu erub eruc erur etbc etbr etcc etco etec etee eter etfb etfc etfe etoe etre etro ette etto ettu eubc euer eufc eur- eurc eure euro eurt fccf fcot fcto febo fece fect feeb feer feet fefc fefe feff fefo feof ferb ferc fere fero ferr fert feru fete fetr fett fetu ffcc ffee ffff ffrr fftf fobt foce foco foer fofo foof foot for- forb fore foro forr fort fote foto fott four fout frbc frcc free freo fret frfc frob froe frot frou frub frue ft-c fter ftfc ftub ftuc fubb fubu fuc- fuct fuet fufc fuff fufu fuor fur- fure furo furr furt fute futo futu o-eo obbo obec ober obet oboe obor obot obre obro ocbc occc occt oce ocee ocef ocet ocre ocro ocrr oct- octe octo ocur oec- oecc oeec oere oeuf ofcr ofer off- offc offe offo offr offu ofor ofre oobe oocr ooer ooff oooo oore oort ootb orbb orbe orbo orbu orce orco ore- oreb orec oreo orer orfe orff orfu oro- oroe orof oror orot orro ortc orte orto orub otee oter otfc oto- otoe otof otoo otor otre otro otte otto ottu otur oucc ouer oufc oufe ouff our- oure ouro ourt out- outb oute outo ouu- rbbb rbbr rcbc rcbo rccb rccc rcet rcfc rctc rebb rebe rebo rebu recc rece recr rect recu reeb reef reet refe reff refr reft refu reof reot reou rere rero rert reru rete reto retr rett reue reuf reut reuu rfef rffc rftc rob- robb robe robo robt robu rocc roce roco roer roet rofc rofe roff rofo roob roof roor root rorc rore roro rort roru rotc rote roto rotr rott roub roue rouf rout rrfc rrrr rtbf rtcc rtce rtee rtfb rtfc rubb rube rubu ruce ruct ruer ruet rufc rufe ruff rufo ruft rurc rure ruro ruru rute ruto rutt rutu tbcb tbcc tbce tbrb tccc tccu tcfc tctc tebo tebu teco tecr tect teec teef teer teet tefc teff teft teor ter- terc tere terf tero terr teru tete teto tetr tett tetu teut tfcu tfeb tfec tfot tftc tobe tobo tobt tobu toce toco toee toer toet toff tofo toft tofu toof toor toot torc tore torf toro torr tort toru totc tote toto totr tott tour tout trcc tre- trec tree tref treo tret treu trfc trfr troc troe troo trot trou trtc trte trtr trub truc true trut truu ttbb tteo tter ttfc ttff ttoe tttt tubb tube tubo tubr tubu tucc tuco tuer tuet tufc tufe tuff tufo tuft tufu tuor turb turc ture turf turo turr turt turu tute tuto tutt tutu tuuo ubbe ubbo uber ubet uboc ubtf ucbc ucfb ucrc ucut ufcu ufer uffe uocc uofo uor- uore urbe ure- uret urfe urff urft uro- uroo urre urte urur urut utec uter utfo utor utto uttu uuoc uutf uuuu