a-ak a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aack aacr aaea aaec aaka aake aara aarc aare abaa abab abac abae abak abar abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abez abra abrc abza acaa acab acac acae acar acba acca accc acce ace- acea acec acek acer acke acr- acra acrc acre acrr aeac aecb aeer aeka aer- aera aerc akaa akae akar akca akee aker akka akr- akra akre arab arac arae arak arar arba arbe arc- arca arce area arec aree arek arka arke arr- arra arrc arre arrk arrr arza aza- azab azar azaz azca azer azra azza baaa baak baar baaz baba babb babe babr bac- baca bacc bace back bacz baek baer baez bak- baka bake bakr bar- bara barb barc bare bark barr barz baza baze bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcra beak bear beba bebb bebe beca beck beeb beek beer beka beke bera berc bere berk berr beze brab brac brae brak braz brca brcb brce brea breb brec bree brek brer brez brka brkb brrr brza bzer bzrk bzzz caaa caab caac caba cabe cac- caca cacc cace cack cacr caec caer caka cake cara carb carc care cark carr caza caze cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbka cbkr cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccee ccra ccrc ccre ceac cear ceba cec- ceca cece ceeb ceec ceke cer- cera cerc cere ceza ceze ckac ckbc ckbe ckck cker ckrc crab crac crar crbc crca crcc crce crcr crcz cre- crea creb crec cree crkc czar eaba eaca eacc eaec 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 eeka eeke eera eerc eeze eka- ekab ekeb ekek eker ekka eraz erba erbb erbe erca ercc erce ereb erec erer erez erke erra errc erre ezek ezer ezra kaaa kaab kaak kaar kaba kabb kabc kabe kabr kabz kacb kacc kace kacz kaer kaka kakc kake kakk kara karb kare kark karr karz kaza kazc kaze kazr kazz kbaa kbab kbac kbae kbak kbar kbaz kbba kbbb kbbc kbbe kbbk kbbr kbbz kbca kbcb kbce kbck kbcr kbcz kbeb kbec kbee kbek kber kbez kbkb kbkk kbkr kbkz kbra kbrb kbrc kbre kbrk kbrz kbzc kbze kbzz kcaa kcab kcac kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcea kceb kcec kcee kcez kckc kckk kckr kckz kcrc kcrr kcrz kcze kczz kea- keak kear keaz keba kebb kebc kebe kebr keca keck kecr keek keer keka kekb kekc keke ker- kera kerb kerc kere kerk kerr kerz keza kezb keze kezr kezz kkaa kkac kkar kkba kkbb kkbe kkbr kkbz kkcb kkck kkcr kkea kkez kkkk kkrb kkrc kkre kkrk kkrr kkrz kkzz krab krac krae krak krar kraz krba krbb krbe krbk krbr krbz krca krcb krcc krce krea kreb krec kree krek krez krka krkc krke krkk krkr krkz krrb krrc krre krrk krrr krrz krza krze krzk krzr krzz kzar kzaz kzbb kzbe kzbk kzbr kzbz kzcr kzee kzer kzke kzkr kzkz kzrb kzrc kzrk kzrr kzrz kzza kzzb kzzk kzzr kzzz raab raak raaz raba rabb rabe rabk rac- raca racc race rack raec raer raka rake rakk rara rarb rare rark rarz raza raze razr razz rbbb rbbr rcac rcbc rccb rccc rea- reac reae reak rear reba rebb rebe rebk reca recc rece reck recr recz reeb reek reka reke rera rere reza reze rrrr rzab rzka zaar zaba zabr zaca zack zaer zaka zakk zara zarb zare zark zarr zaza zbar zbek zber zcar zeae zeba zebe zeca zeck zeek zeke zekr zera zerk zeze zrce zrze zzzz