bbbb bbeb bbet bblb bbrc bcbc bccc bccl bcec bcer bcet bctc bebb bebe beeb beel beer beet bele bell belt berc bere berr bert betc bete bett blbt bleb blee blet blrc brcb brce breb brec bree brel brer bret brrr brtc btcc btcl btec btrc btrt bttb cbbc cbcc cbce cbcl cbcr cbct cbec cbee cber cbet cblb cblc cbre cbrl cbrt cbtc cbtl ccbc cccb cccc cccl ccee ccel cclc ccrc ccre ccrl ccrt cctb cctc cctl cctt cec- cece cect ceeb ceec ceel cel- celc cele cell celt cer- cerc cere cerl cert cet- cete clec clee cler clet cltb cltc crbc crcc crce crcr cre- creb crec cree cret crrt crtc crtl ctec ctle ctrc ctrl e-cl ebbc ebbr ebcc ebel eber ecbc ecbe eccb eccc ecce eccl ecct eclt ecrc ecrl ecrr ect- ectc eeee eele eerc eetc eete el-b elbe elcb elce elec elee eler elet elle elte erbb erbe ercc erce ereb erec erel erer eret erle erll errc erre ertl etbc etbr etcc etec etee etel eter etre ette lbcc lblr lbrt lcbc lccc lcce lcer lcrl lctl lece lect leel leer leet lele lell lerc lere lert lete lett llcc llet lllc llll lrrc lrrr ltbl ltcc ltee lttc lttr rbbb rbbr rbcl rble rcbc rccb rccc rcet rcle rctc rebb rebe recc rece recr rect reeb reel reet relb rele rell relt rere rert rete retr rett rlee rrle rrrr rtcc rtce rtee rtle rtlt tbcb tbcc tbce tbrb tccc tctc tecl tecr tect teec teel teer teet tel- telc tele tell telt ter- terc tere terr tete tetr tett trcc trcl tre- trec tree tret trtc trte trtr ttbb tter tttt