a-ak a-be aaaa aaab aaac aaad aaae aaaf aaal aaba aabb aabc aabd aabl aaca aacb aacc aacd aace aacf aack aacl aada aadc aade aaea aaec aafa aafb aafc aafd aaff aafl aaka aake aala aalc aald aale aall abaa abab abac abad abae abaf abak abal abb- abba abbb abbe abca abcb abcc abcd abcf abcl abda abec abed abee abel abff abla able acaa acab acac acad acae acba acbl acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acek acel acfc acfd acfe acfl ackd acke acla aclc acle adaa adab adac adad adae adak adal adba adbc adcc adda addc addd adde addl adea adeb adee adel adfa adfc adfl adle aeac aeaf aecb aecl aede aeka aela aelc afaa afad afak afca afcb afcc afdb afdc afdl afee afek afel affa affc afka afla aflc afle akaa akae akal akca aked akee akel akka akle alaa alac alad alae alak alal alb- alba albc albe alca alcc alce ald- alda alde aldl alea alec aled alee alef alek alfa alfe alk- alka alkb alkd alke all- alla alle alll baaa baad baaf baak baal baba babb babe bac- baca bacc bace back bada badb badd bade baed baek bael bafc baff bak- baka bake bakl bala balc bald bale balf balk ball bbad bbbb bbdd bbeb bbfc bblb bcaa bcbc bcca bccc bccl bcda bcde bcec bcfc bdbc bddc bdle bead beaf beak beal beba bebb bebe beca beck beda bede bedl beeb beed beef beek beel befa befe beff beka beke bela beld bele belk bell bfca bffl blaa blab blac blad blae blak bldc blea bleb bled blee blek blfc blkb blkd c-cd caaa caab caac caaf caal caba cabe cabf cac- caca cacc cace cack cada cadc cadd cade caec cafa cafb cafc cafe caff cafl caka cake cala calc cald cale calf calk call cbac cbal cbbc cbca cbcc cbce cbcl cbdb cbdc cbea cbec cbee cbef cbfb cbfc cbka cbkl cblb cblc ccaa ccab ccac ccad ccaf ccba ccbc ccca cccb cccc cccf cccl ccdc ccdf cced ccee ccel ccfa ccfc ccfd ccff ccfl ccla cclc cd-e cdaa cdac cdad cdba cdbf cdda cddb cddl cdec cdef cdfa cdfe ceac cead ceal ceba cec- ceca cece ceda cedd cede ceeb ceec ceel cef- cefa cefc ceke cel- cela celc cele celf cell cfaa cfab cfac cfae cfbc cfca cfcb cfcf cfcl cfda cffb ckac ckbc ckbe ckck ckcl cklf clab clad claf clcd cldc clea clec cled clee clef clek daab daad daae daal daba dabb daca dace dada dade daeb dafa dafc dafe daff daka dake dala dale dalf dalk dall dbcc dbfc dcbc dcca dccb dccc dccl dcdb dcfc dddd ddlc deac dead deae deaf deak deal deba debe dec- deca decc decd dece deck decl deda dedd dede deeb deed deef deek deel defe deff dek- deka deke dela deld dele delf delk dell dfaf dfcc dffa dkba dkdc dlab dlbd e-cl e-la eaaf eaba eaca eacc eada eadb eadd eaec eafb eala ealc eald eale ebac ebal ebba ebbc ebcc ebed ebel ebfc ebla ecaa ecac ecad ecal ecbc ecbe ecca eccb eccc ecce eccl ecdc ecdf ecdl eced ecef ecfa ecfc ecka ecla edac edad edca edda eddc edde ede- edea edel edfa edfl edla edle eeca eede eeea eeee eefa eefe eefl eeka eeke eele efab efca efda effa efke efla eka- ekab ekeb eked ekek ekfc ekka el-b elab elac elad elal elba elbe elca elcb elce elda elde elea elec eled elee elef elek elfa elfc elfe elka elke ella elle f--k faaa faac faad faba fabd fabe faca facc face fack fada fadd fade faeb fafa fafc fafe faff fake fala falc fald fale falk fall fbla fble fcab fcal fcba fcca fccf fcda fdca fead feaf feak feal feba fece feck feda fede feeb feed feek feel fefc fefe feff feke fela feld fele felf felk fell ffcc ffee ffff fkab flab flac flad flae flak flcl flea fled flee kaaa kaab kaaf kaak kaal kaba kabb kabc kabd kabe kabf kacb kacc kacd kace kacl kad- kada kadd kade kadf kadl kael kafa kafc kafe kaff kaka kakc kake kakk kala kalb kalc kald kale kalf kalk kall kbaa kbab kbac kbad kbae kbak kbal kbba kbbb kbbc kbbd kbbe kbbf kbbk kbbl kbca kbcb kbce kbck kbcl kbdb kbde kbdf kbdl kbeb kbec kbed kbee kbef kbek kbel kbfb kbfc kbff kbfk kbfl kbkb kbkf kbkk kbkl kbla kblb kbld kble kblf kbll kcaa kcab kcac kcad kcal kcba kcbc kcbd kcbf kcbk kcbl kcca kccb kccc kccd kcck kccl kcda kcdc kcdd kcea kceb kcec kced kcee kcel kcfa kcfb kcfc kcfd kcfl kckc kckf kckk kckl kcla kclc kcle kclf kclk kcll kdaa kdab kdac kdad kdae kdaf kdak kdal kdbb kdbl kdca kdcc kdcd kdce kddb kddc kddd kddf kddk kddl kdeb kdec kdef kdel kdfc kdka kdkb kdkd kdkk kdla kdlb kdlc kdld kdlf kdll kea- kead keak keal keba kebb kebc kebe keca keck keda kedb kedc kedd kede keed keef keek keel kefa kefb kefc keff keka kekb kekc keke kekl kela keld kele kelf kelk kell kfab kfac kfal kfbc kfbk kfcd kfcf kfda kfeb kfed kfel kffa kffb kfff kffk kfka kfkb kfla kflb kflc kfld kflf kfll kkaa kkac kkal kkba kkbb kkbd kkbe kkbl kkcb kkcd kkck kkcl kkda kkdc kkdd kkdl kkea kked kkkk kklb kklc kkld kklf kkll klaa klab klac klad klaf klak klal klbb klbc klbd klbe klbf klbl klca klcb klcc klcd klce klck klcl kldc kldd klde klea kleb klec kled klee klef klek klfa klfc klfd klfe klff klka klkc klkk klkl klla kllb kllc klle kllk laaa laac laad laak laal laba labe laca lacc lace lack lacl lada ladd lade lael lafb lafc lafe laff laka lake lala lald lale lall lbcc lcac lcad lcbc lcca lccc lcce lcdd lcfc ldcf leaa lead