-er a-a a-b a-c aaa aab aac aae aag aak aar ab- aba abb abc abe abg abk abr ac- aca acb acc ace acg ack acr aea aeb aec aee aeg aek aer ag- aga agb agc age agg agk agr aka akb akc ake akg akk akr ar- ara arb arc are arg ark arr baa bab bac bae bag bak bar bba bbb bbc bbe bbg bbk bbr bca bcb bcc bce bcg bck bcr be- bea beb bec bee beg bek ber bga bgb bgc bge bgg bgk bgr bka bkb bkc bke bkg bkk bkr bra brb bre brg brk brr c-- caa cab cac cae cag cak car cba cbb cbc cbe cbg cbk cbr cca ccb ccc cce ccg cck ccr ce- cea ceb cec cee ceg cek cer cga cgb cgc cge cgg cgr cka ckb ckc cra crb crc cre crg crk crr eaa eab eac eae eag eak ear eba ebb ebc ebe ebg ebk ebr ec- eca ecb ecc ece ecg eck ecr eea eeb eec eee eeg eek eer ega egb egc ege egg egr eka ekb ekc eke ekg ekr era erb erc ere erg erk err gaa gab gac gae gag gak gar gba gbc gbe gbg gbk gbr gca gcb gcc gce gcg gck gcr ge- gea geb gec gee geg gek ger gga ggb ggc ggg ggr gka gkb gra grb grc gre grg grk grr ka- kaa kab kac kae kag kak kar kba kbb kbc kbe kbk kbr kca kcb kcc kce kcg kck kcr ke- kea keb kec kee keg kek ker kga kgb kgc kkb kkc kke kkk kkr kra krc krg krk krr ra- raa rab rac rae rag rak rar rba rbb rbc rbe rbg rbk rbr rca rcb rcc rce rcg rcr re- rea reb rec ree reg rek rer rga rgb rgc rge rgg rgk rgr rkb rkc rke rkg rkk rra rrb rrc rrg rrk rrr

a-ak a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aack aacr aaea aaec aage aaka aake aara aarc aare abaa abab abac abae abag abak abar abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abra abrc acaa acab acac acae acag acar acba acca accc acce ace- acea acec acek acer acga acgr acke acr- acra acrc acre acrr aeac aecb aeer aega aeka aer- aera aerc agac agag agar agba agca agcc agce agea agee ager agga agge agra agre akaa akae akar akca akee akeg aker akka akr- akra akre arab arac arae arag arak arar arba arbe arc- arca arce area arec aree areg arek arga argb arge arka arke arr- arra arrc arre arrg arrk arrr baaa baak baar baba babb babe babr bac- baca bacc bace back baek baer baga bage bagg bak- baka bake bakr bar- bara barb barc bare barg bark barr bbbb bbeb bbga bbrc bbrg bcaa bcar bcbc bcbg bcca bccc bcec bcer bcra beag beak bear beba bebb bebe beca beck beeb beeg beek beer bega begg beka beke bera berc bere berg berk berr bgca brab brac brae brag brak brca brcb brce brea breb brec bree breg brek brer brka brkb brrr caaa caab caac caba cabe cabg cac- caca cacc cace cack cacr caec caer caga cage cagg cagr caka cake cara carb carc care cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbga cbgb cbka cbkg cbkr cbre ccaa ccab ccac ccag ccar ccba ccbc ccca cccb cccc ccee ccga ccgc ccra ccrc ccre ccrg ceac cear ceba cec- ceca cece ceeb ceec cege ceke cer- cera cerc cere cgac cgcc cgcg cger ckac ckbc ckbe ckck cker ckga ckrc crab crac crag crar crbc crca crcc crce crcr cre- crea creb crec cree creg crkc eaba eaca eacc eaec eaga eage eara earb eare ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecka ecra ecrc ecrr eeca eeea eeee eega eeka eeke eera eerc eerg egaa egae egar egba egbe egcc egcg egcr egea egec egee eger eggb egge egra egre eka- ekab ekeb ekek eker ekka erba erbb erbe erca ercc erce ereb erec erer erg- erga ergg erke erra errc erre gaar gaba gabb gabe gabr gace gack gaea gaec gaer gaga gage gagg gara garb gare garg garr gbag gc-c gcaa gcbc gccc gcrg geab gear geba gebe geca gece geck geek geer gege gegg gera gerb gere gggg grab grac grae grbr grcc grce grea greb grec gree greg grrr kaaa kaab kaag kaak kaar kaba kabb kabc kabe kabg kabr kacb kacc kace kaer kag- kaga kagb kagc kage kagg kagr kaka kakc kake kakk kara karb kare karg kark karr kbaa kbab kbac kbae kbak kbar kbba kbbb kbbc kbbe kbbg kbbk kbbr kbca kbcb kbce kbck kbcr kbeb kbec kbee kbek kber kbga kbgb kbge kbgg kbgr kbkb kbkg kbkk kbkr kbra kbrb kbrc kbre kbrg kbrk kcaa kcab kcac kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcea kceb kcec kcee kceg kcgc kcgr kckc kckk kckr kcrc kcrg kcrr kea- keag keak kear keba kebb kebc kebe kebr keca kecg keck kecr keek keer kega kege kegg kegk kegr keka kekb kekc keke ker- kera kerb kerc kere kerk kerr kgab kgac kgak kgba kgbb kgbc kgbr kgcb kgcc kgce kgcr kgeb kgec kgga kggg kggr kgra kgrb kgrc kgre kgrg kgrk kgrr kkaa kkac kkag kkar kkba kkbb kkbe kkbg kkbr kkcb kkck kkcr kkea kkeg kkgb kkgr kkkk kkrb kkrc kkre kkrk kkrr krab krac krae krag krak krar krba krbb krbe krbg krbk krbr krca krcb krcc krce krcg krea kreb krec kree krek krka krkc krke krkk krkr krrb krrc krre krrg krrk krrr raab raag raak raba rabb rabe rabk rac- raca racc race rack raec raeg raer raga rage ragg raka rake rakk rara rarb rare