a-ak a-ha aaaa aaab aaac aaad aaah aaar aaba aabb aabc aabd aabh aaca aacb aacc aacd aach aack aacr aada aadc aaha aahk aaka aara aarc aard abaa abab abac abad abak abar abb- abba abbb abbr abca abcb abcc abcd abch abcr abda abha abhr abra abrc acaa acab acac acad acar acba acca accc accd acch acda acdb acdc acha achh achr ackd acr- acra acrc acrr adaa adab adac adad adah adak adar adba adbc adcc adda addc addd addr adha adhd adra ahab ahac ahad ahah ahar ahha ahra ahrc ahrr akaa akah akar akca akha akka akr- akra arab arac arad arah arak arar arba arbh arc- arca arch arda ardc arh- arka arkh arr- arra arrc arrh arrk arrr baaa baad baah baak baar baba babb babr bac- baca bacc bach back bada badb badd badh badr baha bahr bak- baka bakh bakr bar- bara barb barc bard barh bark barr bbad bbbb bbch bbdd bbrc bcaa bcar bcbc bcca bccc bcda bchd bcra bd-r bdbc bddc bddh bhar bhca bhcc bhra brab brac brad brah brak brca brcb brda brka brkb brrr c-cd caaa caab caac caah caba cac- caca cacc cach cack cacr cada cadc cadd cadr caha caka cara carb carc card cark carr cbac cbar cbbc cbca cbcc cbcr cbdb cbdc cbha cbka cbkr cbrd cbrh ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc ccdc ccdh ccdr ccha cchr ccra ccrc cd-r cdaa cdac cdad cdba cdda cddb cddr chaa chab chac chad chah chak char chca chch chha chka chkb chra chrb chrc chrd chrr ckac ckbc ckch ckck ckrc ckrd crab crac crar crbc crca crcc crcr crda crdc crkc daab daad daar daba dabb daca dada daha daka dara darb darc dard dark darr dbar dbcc dcbc dcca dccb dccc dcdb dcra dcrk dddd ddrc dhaa dhad dhak dhar dkba dkdc draa drab drac drad drak drar drba drbc drca drda drra haab haad haak haar haba hack hada hadh haha haka hakk hara harc hard harh hark harr hbar hbcd hcbc hcca hccb hccc hcch hcdr hcrd hdbk hdca hdda hdra hhaa hhhh hkcc hrac hrad hrdc hrrc kaaa kaab kaak kaar kaba kabb kabc kabd kabr kacb kacc kacd kach kad- kada kadd kadr kaha kahc kahr kaka kakc kakh kakk kara karb kard kark karr kbaa kbab kbac kbad kbak kbar kbba kbbb kbbc kbbd kbbk kbbr kbca kbcb kbch kbck kbcr kbdb kbdr kbhb kbhc kbhh kbhr kbkb kbkk kbkr kbra kbrb kbrc kbrd kbrh kbrk kcaa kcab kcac kcad kcah kcar kcba kcbc kcbd kcbk kcbr kcca kccb kccc kccd kcck kccr kcda kcdc kcdd kcdr kcha kchh kchk kchr kckc kckk kckr kcrc kcrh kcrr kdaa kdab kdac kdad kdak kdar kdbb kdbr kdca kdcc kdcd kdcr kddb kddc kddd kddk kddr kdka kdkb kdkd kdkk kdkr kdrb khab khac khad khak khar khbc khbd khbr khca khcb khcc khch khck khdc khdk khdr khhk khka khkk khkr khra khrd khrk khrr kkaa kkac kkar kkba kkbb kkbd kkbr kkcb kkcd kkch kkck kkcr kkda kkdc kkdd kkha kkhb kkhh kkhk kkhr kkkk kkrb kkrc kkrh kkrk kkrr krab krac krad krah krak krar krba krbb krbd krbk krbr krca krcb krcc krcd krch krda krdc krdd krdr krhc krka krkc krkd krkh krkk krkr krrb krrc krrk krrr raab raad raak raba rabb rabk rac- raca racc rach rack rada radc radd radh radr raha rahr raka rakk rara rarb rark rbbb rbbr rcac rcbc rccb rccc rcdc rchb rcrd rdac rrad rrah rrrr