-er a-a a-b a-c a-t aaa aab aac aae aag aak aar aat ab- aba abb abc abe abg abk abr abt ac- aca acb acc ace acg ack acr act aea aeb aec aee aeg aek aer aet ag- aga agb agc age agg agk agr agt aka akb akc ake akg akk akr ar- ara arb arc are arg ark arr art at- ata atb atc ate atg atr att baa bab bac bae bag bak bar bat bba bbb bbc bbe bbg bbk bbr bbt bca bcb bcc bce bcg bck bcr bct be- bea beb bec bee beg bek ber bet bga bgb bgc bge bgg bgk bgr bgt bka bkb bkc bke bkg bkk bkr bkt bra brb bre brg brk brr brt bta btb btc bte btg btk btr btt c-- caa cab cac cae cag cak car cat cba cbb cbc cbe cbg cbk cbr cbt cca ccb ccc cce ccg cck ccr cct ce- cea ceb cec cee ceg cek cer cet cga cgb cgc cge cgg cgr cgt cka ckb ckc ckt cra crb crc cre crg crk crr crt cta ctb ctc cte ctg ctk ctr ctt eaa eab eac eae eag eak ear eat eba ebb ebc ebe ebg ebk ebr ebt ec- eca ecb ecc ece ecg eck ecr ect eea eeb eec eee eeg eek eer eet ega egb egc ege egg egr egt eka ekb ekc eke ekg ekr ekt era erb erc ere erg erk err ert eta etb etc ete etg etk etr ett gaa gab gac gae gag gak gar gat gba gbc gbe gbg gbk gbr gbt gca gcb gcc gce gcg gck gcr gct ge- gea geb gec gee geg gek ger get gga ggb ggc ggg ggr ggt gka gkb gkt gra grb grc gre grg grk grr grt gta gtb gtc gte gtg gtk gtr gtt k-t ka- kaa kab kac kae kag kak kar kat kba kbb kbc kbe kbk kbr kca kcb kcc kce kcg kck kcr kct ke- kea keb kec kee keg kek ker ket kga kgb kgc kkb kkc kke kkk kkr kkt kra krc krg krk krr krt kta ktb ktc kte ktg ktk ktr ktt ra- raa rab rac rae rag rak rar rat rba rbb rbc rbe rbg rbk rbr rbt rca rcb rcc rce rcg rcr rct re- rea reb rec ree reg rek rer ret rga rgb rgc rge rgg rgk rgr rgt rkb rkc rke rkg rkk rkt rra rrb rrc rrg rrk rrr rrt rta rtb rtc rte rtg rtk rtr rtt taa tab tac tae tag tak tar tat tba tbb tbc tbe tbg tbk tbr tbt tca tcb tcc tce tcg tck tcr tct te- tea teb tec tee teg tek ter tet tga tgb tgc tge tgg tgk tgr tgt tka tkb tkc tke tkg tkk tkr tkt tra trb trc tre trg trk trr trt tta ttb ttc tte ttg 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 aage aaka aake aara aarc aare aart aata aatc aatk aatt abaa abab abac abae abag 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 acag acar acat acba acca accc acce acct ace- acea acec acek acer acet acga acgr acke acr- acra acrc acre acrr acta actc acte actg actt aeac aecb aect aeer aega aeka aer- aera aerc aeta aetc aetr aett agac agag agar agat agba agca agcc agce agct agea agee ager aget agga agge agra agre agta agte agtr akaa akae akar akca akee akeg aker akka akr- akra akre akte arab arac arae arag arak arar arat arba arbe arc- arca arce arct area arec aree areg arek aret arga argb arge arka arke arr- arra arrc arre arrg 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 baga bage bagg bagt bak- baka bake bakr bakt bar- bara barb barc bare barg bark barr bart bata batc bate batt bbbb bbeb bbet bbga bbrc bbrg bcaa bcar bcat bcbc bcbg bcca bccc bcec bcer bcet bcra bctc beag beak bear beat beba bebb bebe beca beck beeb beeg beek beer beet bega begg beka beke bera berc bere berg berk berr bert beta betc bete bett bgca brab brac brae brag brak brat brca brcb brce brea breb brec bree breg brek brer bret brka brkb brrr brtc btaa btcc btec btek btrc btrt bttb caaa caab caac caat caba cabe cabg cac- caca cacc cace cack cacr caec caer caga cage cagg cagr 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 cbga cbgb cbka cbkg cbkr cbre cbrt cbta cbtc ccaa ccab ccac ccag ccar ccat ccba ccbc ccca cccb cccc ccee ccga ccgc ccgt ccra ccrc ccre ccrg ccrt cctb cctc cctt ceac cear ceat ceba cec- ceca cece cect ceeb ceec cege ceke cer- cera cerc cere cert cet- ceta cete cgac cgcc cgcg cger ckac ckat ckbc ckbe ckck cker ckga ckrc cktb crab crac crag crar crat crbc crca crcc crce crcr cre- crea creb crec cree creg cret crkc crrt crtc ctab ctae ctag ctba ctca ctec ctge ctrc ctta eaba eaca eacc eaec eaga eage 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 eega eeka eeke eera eerc eerg eeta eetc eete egaa