-ana a-ak aaaa aaab aaac aaal aaan aaba aabb aabc aabl aaca aacb aacc aack aacl aacn aaka aala aalc aall aana abaa abab abac abak abal aban abb- abba abbb abca abcb abcc abcl abcn abla acaa acab acac acan acba acbl acca accc acla aclc akaa akal akan akca akka akna alaa alac alak alal alan alb- alba albc alca alcc alk- alka alkb all- alla alll alln alna ana- anaa anab anac anak anal anan anba anbb anbl anca ancc ank- anka anla anlc anln anna annb baaa baak baal baan baba babb bac- baca bacc back bacn bak- baka bakl bala balc balk ball bana banc bank bann bbbb bblb bcaa bcbc bcca bccc bccl blaa blab blac blak blan blkb caaa caab caac caal caan caba cac- caca cacc cack caka cala calc calk call cana canc cank cann cbac cbal cbbc cbca cbcc cbcl cbcn cbka cbkl cbkn cblb cblc cbln cbna ccaa ccab ccac ccba ccbc ccbn ccca cccb cccc cccl ccla cclc ccna ccnb ccnc ckac ckan ckbc ckck ckcl ckln cknb cknc clab clan cnaa cnac cnbc cnbl cnna kaaa kaab kaak kaal kaan kaba kabb kabc kacb kacc kacl kaka kakc kakk kakn kala kalb kalc kalk kall kaln kana kanb kann kbaa kbab kbac kbak kbal kbba kbbb kbbc kbbk kbbl kbca kbcb kbck kbcl kbkb kbkk kbkl kbla kblb kbll kbna kbnl kbnn kcaa kcab kcac kcal kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kckc kckk kckl kckn kcla kclc kclk kcll kcln kcnb kkaa kkac kkal kkan kkba kkbb kkbl kkbn kkcb kkck kkcl kkcn kkkk kklb kklc kkll kkln kknb kknn klaa klab klac klak klal klan klbb klbc klbl klbn klca klcb klcc klck klcl klcn klka klkc klkk klkl klkn klla kllb kllc kllk klnc klnn knaa knab knac knal knan knba knbb knbc knbn knca kncb knck kncn knkk knla knlb knlc knnb knnk laaa laac laak laal laan laba laca lacc lack lacl laka lala lall lan- lana lanc lank lann lbcc lcac lcbc lcca lccc lkab lkal lkan llan llcc lllc llll lnnk naaa naab naac naal naan naba nabc nabk nabl naca nacc nack nacl naka nala nalc nall nan- nana nanb nann nbaa nbak nbbc nbca nbcc ncaa ncac ncba ncbc ncca nccc nccn nclc ncln ncna ncnc nlab nlcc nnnn