-ana a-ak aaaa aaab aaac aaaf aaal aaan aaar aaba aabb aabc aabl aaca aacb aacc aacf aack aacl aacn aacr aafa aafb aafc aaff aafl aaka aala aalc aall aana aara aarc abaa abab abac abaf abak abal aban abar abb- abba abbb abbr abca abcb abcc abcf abcl abcn abcr abff abla abra abrc acaa acab acac acan acar acba acbl acca accc accf acfc acfl acla aclc aclr acr- acra acrc acrr afaa afak afan afar afca afcb afcc affa affc afka afkr afla aflc afr- afra afrc akaa akal akan akar akca akka akna akr- akra alaa alac alak alal alan alar alb- alba albc alca alcc alfa alk- alka alkb all- alla alll alln allr alna ana- anaa anab anac anak anal anan anar anba anbb anbl anca ancc anfa ank- anka anla anlc anln anna annb anrc arab arac araf arak aral aran arar arba arc- arca arfa arfb arfc arff arka arla arna arnk arr- arra arrc arrk arrr baaa baaf baak baal baan baar baba babb babr bac- baca bacc back bacn bafc baff bak- baka bakl bakr bala balc balf balk ball bana banc bank bann banr bar- bara barb barc barf bark barn barr bbbb bbfc bbfn bblb bbrc bcaa bcar bcbc bcca bccc bccl bcfc bcra bfca bffl blaa blab blac blak blan blfc blkb blrc bnrr brab brac braf brak bran brca brcb brfc brka brkb brna brrr caaa caab caac caaf caal caan caba cabf cac- caca cacc cack cacr cafa cafb cafc caff cafl caka cala calc calf calk call cana canc cank cann cara carb carc carf cark carl carn carr cbac cbal cbar cbbc cbca cbcc cbcl cbcn cbcr cbfb cbfc cbka cbkl cbkn cbkr cblb cblc cbln cbna cbrl cbrn ccaa ccab ccac ccaf ccar ccba ccbc ccbn ccca cccb cccc cccf cccl ccfa ccfc ccff ccfl ccla cclc ccna ccnb ccnc ccnf ccnr ccra ccrc ccrf ccrl cfaa cfab cfac cfar cfbc cfbn cfbr cfca cfcb cfcf cfcl cfcn cffb cffr cfln cfnb cfnr cfra cfrb cfrn ckac ckan ckbc ckck ckcl ckfr cklf ckln cknb cknc ckrc clab claf clan clar clra cnaa cnac cnbc cnbl cnfa cnna cnrc cnrr crab crac craf cran crar crbc crca crcc crcr crfc crfl crkc crkl crlf crna f--k faaa faac faan faba faca facc fack fafa fafc faff fala falc falk fall faln fana fanc fank fara farb farc fark farl farr fbar fbla fcab fcal fcar fcba fcca fccf fcnl fcra ffar ffcc ffff ffrr fkab flab flac flak flan flcl flna flnb flnc fnac fnar fnlc frab frac frak fran frbc frcc frcn frfc frla kaaa kaab kaaf kaak kaal kaan kaar kaba kabb kabc kabf kabr kacb kacc kacl kafa kafc kaff kafn kafr kaka kakc kakk kakn kala kalb kalc kalf kalk kall kaln kana kanb kanf kann kara karb karf kark karl karn karr kbaa kbab kbac kbak kbal kbar kbba kbbb kbbc kbbf kbbk kbbl kbbr kbca kbcb kbck kbcl kbcr kbfb kbfc kbff kbfk kbfl kbfr kbkb kbkf kbkk kbkl kbkr kbla kblb kblf kbll kblr kbna kbnl kbnn kbnr kbra kbrb kbrc kbrf kbrk kbrl kbrn kcaa kcab kcac kcal kcar kcba kcbc kcbf kcbk kcbl kcbr kcca kccb kccc kcck kccl kccr kcfa kcfb kcfc kcfl kcfn kckc kckf kckk kckl kckn kckr kcla kclc kclf kclk kcll kcln kclr kcnb kcnr kcrc kcrn kcrr kfab kfac kfal kfan kfar kfbc kfbk kfbn kfcf kfcr kffa kffb kfff kffk kffn kfka kfkb kfla kflb kflc kflf kfll kfln kfna kfnc kfnf kfnk kfnl kfnn kfra kfrc kfrn kfrr kkaa kkac kkal kkan kkar kkba kkbb kkbl kkbn kkbr kkcb kkck kkcl kkcn kkcr kkfn kkfr kkkk kklb kklc kklf kkll kkln kknb kknn kkrb kkrc kkrf kkrk kkrl kkrn kkrr klaa klab klac klaf klak klal klan klar klbb klbc klbf klbl klbn klca klcb klcc klck klcl klcn klcr klfa klfc klff klfn klka klkc klkk klkl klkn klkr klla kllb kllc kllk klnc klnn klrc klrf klrk klrn klrr knaa knab knac knaf knal knan knar knba knbb knbc knbn knbr knca kncb knck kncn kncr knfa knfl knfr knkk knla knlb knlc knlf knlr knnb knnk knnr knrb knrk krab krac krak kral kran krar krba krbb krbk krbl krbr krca krcb krcc krcl krcn krfc krff krfn krka krkc krkk krkn krkr krla krlc krlf krln krna krnb krnk krnn krrb krrc krrf krrk krrl krrn krrr laaa laac laak laal laan laar laba labr laca lacc lack lacl lafb lafc laff laka lala lall lan- lana lanc lank lann lara larb larc larf lark larn larr lbar lbcc lblr lcac lcbc lcca lccc lcfc lcfr lcra lcrl lfca lfcc lkab lkal lkan llan llcc lllc llll lncr lnnk lrac lral lrba lrfc lrrc lrrr naaa naab naac naal naan naar naba nabc nabf nabk nabl naca nacc nacf nack nacl nafa nafc naff nafl naka nala nalc nall nan- nana nanb nann nara narc narf nark narn narr nbaa nbaf nbak nbar nbbc nbca nbcc nbfa nbfc nbfl ncaa ncac ncar ncba ncbc ncca nccc nccf nccn nccr ncfc nclc ncln nclr ncna ncnc ncra ncrc nfaa nfff nfra nkfc nkrf nlab nlcc nlcf nlra nlrb nnnn nrab nrca nrfc nrlb nrna nrrc nrrl raab raaf raak raan raba rabb rabk rabl rac- raca racc rack rafa rafc raff raka rakk rala ralb ralf rall rana ranc rank rann rara rarb rarf rark rbaf rbbb rbbr rbcl rcac rcaf rcbc rccb rccc rcfc rcnl rcnr rffc rffl rkkf rlab rnaf rnal rnbr rrfc rrna rrrr