bbbb bbeb bbet bbrc bcbc bccc bcec bcer bcet bctc bebb bebe beck beeb beek beer beet beke berc bere berk berr bert betc bete bett brcb brce breb brec bree brek brer bret brkb brrr brtc btcc btec btek btrc btrt bttb cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbkr cbre cbrt cbtc ccbc cccb cccc ccee ccrc ccre ccrt cctb cctc cctt cec- cece cect ceeb ceec ceke cer- cerc cere cert cet- cete ckbc ckbe ckck cker ckrc cktb crbc crcc crce crcr cre- creb crec cree cret crkc crrt crtc ctec ctrc ebbc ebbr ebcc eber ecbc ecbe eccb eccc ecce ecct ecrc ecrr ect- ectc eeee eeke eerc eetc eete ekeb ekek eker eket erbb erbe ercc erce ereb erec erer eret erke errc erre etbc etbr etcc etec etee eter etre ette kbbb kbbc kbbe kbbk kbbr kbbt kbcb kbce kbck kbcr kbct kbeb kbec kbee kbek kber kbet kbkb kbkk kbkr kbrb kbrc kbre kbrk kbrt kbtb kbtc kbte kbtk kbtr kbtt kcbc kcbk kcbr kccb kccc kcck kccr kcct kceb kcec kcee kcet kckc kckk kckr kcrc kcrr kcrt kctb kctc kcte kebb kebc kebe kebr kebt keck kecr keek keer keet kekb kekc keke ker- kerb kerc kere kerk kerr kert ket- ketc kete ketk ketr kett kkbb kkbe kkbr kkbt kkcb kkck kkcr kkct kkkk kkrb kkrc kkre kkrk kkrr kkrt kktc kktk krbb krbe krbk krbr krbt krcb krcc krce kreb krec kree krek kret krkc krke krkk krkr krrb krrc krre krrk krrr krrt krtc krtk krtr ktbb ktbc ktbr ktbt ktcc ktce ktck ktcr ktec ktee ktek ktkb ktkc ktke ktkk ktkr ktkt ktrb ktrc ktre ktrk ktrr ktrt kttc kttk kttr kttt rbbb rbbr rcbc rccb rccc rcet rctc rebb rebe rebk recc rece reck recr rect reeb reek reet reke rekt rere rert rete retr rett rrrr rtcc rtce rtee tbcb tbcc tbce tbrb tccc tctc teck tecr tect teec teek teer teet teke ter- terc tere terk terr tete tetr tett trcc tre- trec tree trek tret trtc trte trtr ttbb tter tttt