bbbb bbeb bbet bbrc bcbc bccc bcec bcer bcet bctc bebb bebe beby beeb beer beet beey berc bere berr bert bery betc bete bett beye beyt brcb brce breb brec bree brer bret brex brey brrr brtc bry- brye btcc btcx btec btex btrc btrt btry bttb byce byer byre byrt byte cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbre cbrt cbry cbtc cbyt ccbc cccb cccc ccee ccrc ccre ccrt cctb cctc cctt cec- cece cect ceeb ceec cer- cerc cere cert cery cet- cete cexe ceyx crbc crcc crce crcr cre- creb crec cree cret crex crrt crtc cry- cryb ctec ctrc cxxx cybb cybc cyc- cycb cycc cyre cyrt cyt- cytb cyte cyy- cyyc ebbc ebbr ebby ebcc eber ecbc ecbe eccb eccc ecce ecct ecrc ecrr ect- ectc eeby eeee eerc eery eetc eete eext er-x erbb erbe ercc erce ereb erec erer eret errc erre eryc erye eryx etbc etbr etcc etec etee eter etre ette etty exec exer exrx exte extr exxy eyeb eyec eyer eyet eyey eyre eyry eyte eyyr rbbb rbbr rcbc rccb rccc rcet rctc rcyc rebb rebe recc rece recr rect recy reeb reet rere rert rery rete retr rett rety rexx reye rrrr rtcc rtce rtee rtex rybe ryeb ryet rytt ryyt tbcb tbcc tbce tbrb tcby tccc tctc tecr tect teec teer teet ter- terc tere terr tery tete tetr tett tetx text teye teyr trcc tre- trec tree tret trex trey trtc trte trtr try- tryb trye ttbb tter tttt txtr tyce tyee tyer tyet tyr- tyre tyrr tyte tytt tyty tyxt xbee xeer xer- xert xexe xtry xxxx xxxy xyr- yber ybet ybry yccc ycee yctc yeer yeet yerb yere yerr yert yery yete yett yext yeye yeyr ytre yyyy