a-ak a-ha aaaa aaab aaac aaah aaar aaba aabb aabc aabh aaca aacb aacc aach aack aacr aaha aahk aaka aara aarc abaa abab abac abak abar abb- abba abbb abbr abca abcb abcc abch abcr abha abhr abra abrc acaa acab acac acar acba acca accc acch acha achh achr acr- acra acrc acrr ahab ahac ahah ahar ahha ahra ahrc ahrr akaa akah akar akca akha akka akr- akra arab arac arah arak arar arba arbh arc- arca arch arh- arka arkh arr- arra arrc arrh arrk arrr baaa baah baak baar baba babb babr bac- baca bacc bach back baha bahr bak- baka bakh bakr bar- bara barb barc barh bark barr bbbb bbch bbrc bcaa bcar bcbc bcca bccc bcra bhar bhca bhcc bhra brab brac brah brak brca brcb brka brkb brrr caaa caab caac caah caba cac- caca cacc cach cack cacr caha caka cara carb carc cark carr cbac cbar cbbc cbca cbcc cbcr cbha cbka cbkr cbrh ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccha cchr ccra ccrc chaa chab chac chah chak char chca chch chha chka chkb chra chrb chrc chrr ckac ckbc ckch ckck ckrc crab crac crar crbc crca crcc crcr crkc haab haak haar haba hack haha haka hakk hara harc harh hark harr hbar hcbc hcca hccb hccc hcch hhaa hhhh hkcc hrac hrrc kaaa kaab kaak kaar kaba kabb kabc kabr kacb kacc kach kaha kahc kahr kaka kakc kakh kakk kara karb kark karr kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbr kbca kbcb kbch kbck kbcr kbhb kbhc kbhh kbhr kbkb kbkk kbkr kbra kbrb kbrc kbrh kbrk kcaa kcab kcac kcah kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcha kchh kchk kchr kckc kckk kckr kcrc kcrh kcrr khab khac khak khar khbc khbr khca khcb khcc khch khck khhk khka khkk khkr khra khrk khrr kkaa kkac kkar kkba kkbb kkbr kkcb kkch kkck kkcr kkha kkhb kkhh kkhk kkhr kkkk kkrb kkrc kkrh kkrk kkrr krab krac krah krak krar krba krbb krbk krbr krca krcb krcc krch krhc krka krkc krkh krkk krkr krrb krrc krrk krrr raab raak raba rabb rabk rac- raca racc rach rack raha rahr raka rakk rara rarb rark rbbb rbbr rcac rcbc rccb rccc rchb rrah rrrr