-ene bbbb bbeb bbet bbfc bbfn bbrc bcbc bccc bcec bcer bcet bcfc bctc bebb bebe beeb beef been beer beet befe beff beft bene benn bent berc bere bern berr bert betc bete bett bftt bner bnet bnrr brcb brce breb brec bree bref bren brer bret brfc brrr brtc btcc btec bten btfc btrc btrt bttb cbbc cbcc cbce cbcn cbcr cbct cbec cbee cbef cber cbet cbfb cbfc cbre cbrn cbrt cbtc cbtf ccbc ccbn cccb cccc cccf ccee ccfc ccff ccnb ccnc ccne ccnf ccnr ccrc ccre ccrf ccrt cctb cctc cctt cec- cece cect ceeb ceec cef- cefc cefn cen- cene cent cer- cerc cere cerf cern cert cet- cete cfbc cfbn cfbr cfbt cfcb cfcf cfcn cffb cffr cfnb cfnr cfrb cfre cfrn cfrt cftc cfte cftr cnbc cnet cnrc cnrr cnrt cntc cntf cntr crbc crcc crce crcr cre- creb crec cree cren cret crfc crne crrt crtc crtf ctcf ctec cten ctfc ctne ctrc ctrn cttn ebbc ebbr ebcc eben eber ebfc ecbc ecbe eccb eccc ecce ecct ecef ecfc ecfr ecne ecrc ecrf ecrr ect- ectc ectf eeee eefe eefn eent eerc eetc eete efbr efen efet eft- enb- enbn enbr ence enee ener enfb ennc enne ent- ente entr erbb erbe ercc erce ereb erec eren erer eret erfc erft erne errc erre etbc etbr etcc etec etee eten eter etfb etfc etfe etne etnr etre ette ettn fccf fece fect feeb feen feer feet fefc fefe feff fene fenn fent ferb ferc fere fern ferr fert fete fetr fett ffcc ffee ffff ffrr fftf fnet fntb frbc frcc frcn free fren fret frfc ft-c ften fter ftfc nbbc nbcc nber nbfc ncbc nccc nccf nccn nccr ncct ncec ncee ncef ncen ncer ncfc ncfe ncnc ncrc ncre nctc ncte nctr nebb nebe nebn nebr necc nece necr nect neeb neef neen neer neet nefe neff nene nent nerc nere nerf nerr nert net- netb nete nett nfct nfer nfff nftc nnnn nntn nren nrfc nrrc ntbc ntcc nter ntfc ntrc nttr rbbb rbbr rcbc rccb rccc rcet rcfc rcnr rctc rebb rebe recc rece recr rect reeb reef reen reet refe reff refn refr reft rene renn rent rere rert rete retr rett rfef rffc rftc rnbr rnnt rrfc rrrr rtbf rtcc rtce rtee rtfb rtfc tbcb tbcc tbce tbnf tbrb tccc tcfc tcnn tctc tecr tect teec teef teen teer teet tefc teff teft tenb tenc tene tenn tent ter- terc tere terf tern terr tete tetr tett tfeb tfec tftc tnbc tncc tneb tnef tnfc trcc tre- trec tree tref tren tret trfc trfr trtc trte trtr ttbb ttcn tten tter ttfc ttff ttfn tttt