-er a-a a-b a-c a-t aaa aab aac aae aak aar aat ab- aba abb abc abe abk abr abt ac- aca acb acc ace ack acr act aea aeb aec aee aek aer aet aka akb akc ake akk akr ar- ara arb arc are ark arr art at- ata atb atc ate atr att baa bab bac bae bak bar bat bba bbb bbc bbe bbk bbr bbt bca bcb bcc bce bck bcr bct be- bea beb bec bee bek ber bet bka bkb bkc bke bkk bkr bkt bra brb bre brk brr brt bta btb btc bte btk btr btt c-- caa cab cac cae cak car cat cba cbb cbc cbe cbk cbr cbt cca ccb ccc cce cck ccr cct ce- cea ceb cec cee cek cer cet cka ckb ckc ckt cra crb crc cre crk crr crt cta ctb ctc cte ctk ctr ctt eaa eab eac eae eak ear eat eba ebb ebc ebe ebk ebr ebt ec- eca ecb ecc ece eck ecr ect eea eeb eec eee eek eer eet eka ekb ekc eke ekr ekt era erb erc ere erk err ert eta etb etc ete etk etr ett k-t ka- kaa kab kac kae kak kar kat kba kbb kbc kbe kbk kbr kca kcb kcc kce kck kcr kct ke- kea keb kec kee kek ker ket kkb kkc kke kkk kkr kkt kra krc krk krr krt kta ktb ktc kte ktk ktr ktt ra- raa rab rac rae rak rar rat rba rbb rbc rbe rbk rbr rbt rca rcb rcc rce rcr rct re- rea reb rec ree rek rer ret rkb rkc rke rkk rkt rra rrb rrc rrk rrr rrt rta rtb rtc rte rtk rtr rtt taa tab tac tae tak tar tat tba tbb tbc tbe tbk tbr tbt tca tcb tcc tce tck tcr tct te- tea teb tec tee tek ter tet tka tkb tkc tke tkk tkr tkt tra trb trc tre trk trr trt tta ttb ttc tte ttk ttr ttt

a-ak a-be aaaa aaab aaac aaae aaar aaba aabb aabc aabt aaca aacb aacc aace aack aacr aact aaea aaec aaka aake aara aarc aare aart aata aatc aatk aatt abaa abab abac abae abak abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcr abct abec abee aber abet abra abrc abta ac-t acaa acab acac acae acar acat acba acca accc acce acct ace- acea acec acek acer acet acke acr- acra acrc acre acrr acta actc acte actt aeac aecb aect aeer aeka aer- aera aerc aeta aetc aetr aett akaa akae akar akca akee aker akka akr- akra akre akte arab arac arae arak arar arat arba arbe arc- arca arce arct area arec aree arek aret arka arke arr- arra arrc arre arrk arrr arrt arta artc arte artr at-t ataa atab atac atae atak atar atat atca atcc atck atcr atea atec atee ater atka atkt atra atrc atre atrk atta atte attr baaa baak baar baat baba babb babe babr bac- baca bacc bace back bact baek baer bak- baka bake bakr bakt bar- bara barb barc bare bark barr bart bata batc bate batt bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcra bctc beak bear beat beba bebb bebe beca beck beeb beek beer beet beka beke bera berc bere berk berr bert beta betc bete bett brab brac brae brak brat brca brcb brce brea breb brec bree brek brer bret brka brkb brrr brtc btaa btcc btec btek btrc btrt bttb caaa caab caac caat caba cabe cac- caca cacc cace cack cacr caec caer caka cake cara carb carc care cark carr cart cat- cata catb catc cate catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cber cbet cbka cbkr cbre cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc ccee ccra ccrc ccre ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece cect ceeb ceec ceke cer- cera cerc cere cert cet- ceta cete ckac ckat ckbc ckbe ckck cker ckrc cktb crab crac crar crat crbc crca crcc crce crcr cre- crea creb crec cree cret crkc crrt crtc ctab ctae ctba ctca ctec ctrc ctta eaba eaca eacc eaec eara earb eare eart eata eate ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecka ecra ecrc ecrr ect- ecta ectc eeca eeea eeee eeka eeke eera eerc eeta eetc eete eka- ekab ekeb ekek eker eket ekka ekta erat erba erbb erbe erca ercc erce ereb erec erer eret erke erra errc erre erta etak etat etbc etbr etcc etec etee eter etka etra etre etta ette kaaa kaab kaak kaar kaat kaba kabb kabc kabe kabr kacb kacc kace kact kaer kaet kaka kakc kake kakk kakt kara karb kare kark karr kart kat- kata katb katc kate katk katr katt kbaa kbab kbac kbae kbak kbar kbat kbba kbbb kbbc kbbe kbbk kbbr kbbt kbca kbcb kbce kbck kbcr kbct kbeb kbec kbee kbek kber kbet kbkb kbkk kbkr kbra kbrb kbrc kbre kbrk kbrt kbta kbtb kbtc kbte kbtk kbtr kbtt kcaa kcab kcac kcar kcat kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcct kcea kceb kcec kcee kcet kckc kckk kckr kcrc kcrr kcrt kcta kctb kctc kcte kea- keak kear keat keba kebb kebc kebe kebr kebt keca keck kecr keek keer keet keka kekb kekc keke ker- kera kerb kerc kere kerk kerr kert ket- keta ketc kete ketk ketr kett kkaa kkac kkar kkat kkba kkbb kkbe kkbr kkbt kkcb kkck kkcr kkct kkea kkkk kkrb kkrc kkre kkrk kkrr kkrt kktc kktk krab krac krae krak krar krat krba krbb krbe krbk krbr krbt krca krcb krcc krce krea kreb krec kree krek kret krka krkc krke krkk krkr krrb krrc