-ana a-ak aaaa aaab aaac aaan aaar aaba aabb aabc aaca aacb aacc aack aacn aacr aaka aana aara aarc abaa abab abac abak aban abar abb- abba abbb abbr abca abcb abcc abcn abcr abra abrc acaa acab acac acan acar acba acca accc acr- acra acrc acrr akaa akan akar akca akka akna akr- akra ana- anaa anab anac anak anan anar anba anbb anca ancc ank- anka anna annb anrc arab arac arak aran arar arba arc- arca arka arna arnk arr- arra arrc arrk arrr baaa baak baan baar baba babb babr bac- baca bacc back bacn bak- baka bakr bana banc bank bann banr bar- bara barb barc bark barn barr bbbb bbrc bcaa bcar bcbc bcca bccc bcra bnrr brab brac brak bran brca brcb brka brkb brna brrr caaa caab caac caan caba cac- caca cacc cack cacr caka cana canc cank cann cara carb carc cark carn carr cbac cbar cbbc cbca cbcc cbcn cbcr cbka cbkn cbkr cbna cbrn ccaa ccab ccac ccar ccba ccbc ccbn ccca cccb cccc ccna ccnb ccnc ccnr ccra ccrc ckac ckan ckbc ckck cknb cknc ckrc cnaa cnac cnbc cnna cnrc cnrr crab crac cran crar crbc crca crcc crcr crkc crna kaaa kaab kaak kaan kaar kaba kabb kabc kabr kacb kacc kaka kakc kakk kakn kana kanb kann kara karb kark karn karr kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbr kbca kbcb kbck kbcr kbkb kbkk kbkr kbna kbnn kbnr kbra kbrb kbrc kbrk kbrn kcaa kcab kcac kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kckc kckk kckn kckr kcnb kcnr kcrc kcrn kcrr kkaa kkac kkan kkar kkba kkbb kkbn kkbr kkcb kkck kkcn kkcr kkkk kknb kknn kkrb kkrc kkrk kkrn kkrr knaa knab knac knan knar knba knbb knbc knbn knbr knca kncb knck kncn kncr knkk knnb knnk knnr knrb knrk krab krac krak kran krar krba krbb krbk krbr krca krcb krcc krcn krka krkc krkk krkn krkr krna krnb krnk krnn krrb krrc krrk krrn krrr naaa naab naac naan naar naba nabc nabk naca nacc nack naka nan- nana nanb nann nara narc nark narn narr nbaa nbak nbar nbbc nbca nbcc ncaa ncac ncar ncba ncbc ncca nccc nccn nccr ncna ncnc ncra ncrc nnnn nrab nrca nrna nrrc raab raak raan raba rabb rabk rac- raca racc rack raka rakk rana ranc rank rann rara rarb rark rbbb rbbr rcac rcbc rccb rccc rcnr rnbr rrna rrrr