bbbb bbeb bbet bbfc bbrc bcbc bccc bcec bcer bcet bcfc bcof bcor bctc bebb bebe bebo beeb beef beer beet befe beff befo beft beo- beof beor beot berc bere bero berr bert betc bete beto bett bftt bobb bobe bobo boce boco boec boee boef boeo boer boet bofe boff boob booc booe boof boor boot bor- bore borf boro borr bort botb bote boto bott brcb brce breb brec bree bref breo brer bret brfc brob broc broe broo bror brot brrr brtc btcc btec btfc btob btor btrc btrt bttb c-bo cbbc cbcc cbce cbcr cbct cbec cbee cbef cber cbet cbfb cbfc cbot cbre cbrt cbtc cbtf ccbc cccb cccc cccf ccee ccfc ccff ccob ccoc ccrc ccre ccrf ccrt cctb cctc cctt cec- cece ceco cect ceeb ceec cef- cefc ceor 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 coce coco coct cofc cofe coff coft coob coof coot cor- corb corc core corf coro corr cort cotb cotc cote coto cott crbc crcc crce crcr cre- creb crec cree creo cret crfc crob croc croe croo cror crot crrt crtc crtf ctcf ctec ctfc ctfo ctor ctot ctrc ebbc ebbo ebbr ebcc eber ebfc eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecct ecef ecfc ecfr eco- ecot ecrc ecrf ecrr ect- ectc ectf ecto eeee eefe eeoc eerc eero eetc eete efbr efco efeo efet efor eft- eore eotc eoto erbb erbe ercc erce ereb erec erer eret erfc erft erob eroc eroe eroo errc erre erro etbc etbr etcc etco etec etee eter etfb etfc etfe etoe etre etro ette etto fccf fcot fcto febo fece fect feeb feer feet fefc fefe feff fefo feof ferb ferc fere fero ferr fert fete fetr fett ffcc ffee ffff ffrr fftf fobt foce foco foer fofo foof foot for- forb fore foro forr fort fote foto fott frbc frcc free freo fret frfc frob froe frot ft-c fter ftfc o-eo obbo obec ober obet oboe obor obot obre obro ocbc occc occt oce ocee ocef ocet ocre ocro ocrr oct- octe octo oec- oecc oeec oere ofcr ofer off- offc offe offo offr ofor ofre oobe oocr ooer ooff oooo oore oort ootb orbb orbe orbo orce orco ore- oreb orec oreo orer orfe orff oro- oroe orof oror orot orro ortc orte orto otee oter otfc oto- otoe otof otoo otor otre otro otte otto rbbb rbbr rcbc rcbo rccb rccc rcet rcfc rctc rebb rebe rebo recc rece recr rect reeb reef reet refe reff refr reft reof reot rere rero rert rete reto retr rett rfef rffc rftc rob- robb robe robo robt rocc roce roco roer roet rofc rofe roff rofo roob roof roor root rorc rore roro rort rotc rote roto rotr rott rrfc rrrr rtbf rtcc rtce rtee rtfb rtfc tbcb tbcc tbce tbrb tccc tcfc tctc tebo teco tecr tect teec teef teer teet tefc teff teft teor ter- terc tere terf tero terr tete teto tetr tett tfeb tfec tfot tftc tobe tobo tobt toce toco toee toer toet toff tofo toft toof toor toot torc tore torf toro torr tort totc tote toto totr tott trcc tre- trec tree tref treo tret trfc trfr troc troe troo trot trtc trte trtr ttbb tteo tter ttfc ttff ttoe tttt