a-ak a-be aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aack aacr aada aadc aade aaea aaec aafa aafb aafc aafd aaff aaka aake aara aarc aard aare abaa abab abac abad abae abaf abak abar abb- abba abbb abbe abbr abca abcb abcc abcd abcf abcr abda abec abed abee aber abff abra abrc acaa acab acac acad acae acar acba acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acek acer acfc acfd acfe ackd acke acr- acra acrc acre acrr adaa adab adac adad adae adak adar adba adbc adcc adda addc addd adde addr adea adeb adee ader adfa adfc adra adre aeac aeaf aecb aede aeer aeka aer- aera aerc aerd afaa afad afak afar afca afcb afcc afdb afdc afee afek afer affa affc afka afkr afr- afra afrc afre akaa akae akar akca aked akee aker akka akr- akra akre arab arac arad arae araf arak arar arba arbe arc- arca arce arda ardc arde ardf area arec ared aree aref arek arfa arfb arfc arff arka arke arr- arra arrc arre arrk arrr baaa baad baaf baak baar baba babb babe babr bac- baca bacc bace back bada badb badd bade badr baed baek baer bafc baff bak- baka bake bakr bar- bara barb barc bard bare barf bark barr bbad bbbb bbdd bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcfc bcra bd-r bdbc bddc bead beaf beak bear beba bebb bebe beca beck beda bede beeb beed beef beek beer befa befe beff beka beke bera berc berd bere berk berr bfca brab brac brad brae braf brak brca brcb brce brda brea breb brec bred bree bref brek brer brfc brka brkb brrr c-cd caaa caab caac caaf caba cabe cabf cac- caca cacc cace cack cacr cada cadc cadd cade cadr caec caer cafa cafb cafc cafe caff caka cake cara carb carc card care carf cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbea cbec cbee cbef cber cbfb cbfc cbka cbkr cbrd cbre ccaa ccab ccac ccad ccaf ccar ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdr cced ccee ccfa ccfc ccfd ccff ccra ccrc ccre ccrf cd-e cd-r cdaa cdac cdad cdba cdbf cdda cddb cddr cdec cdef cder cdfa cdfe cdre ceac cead cear ceba cec- ceca cece ceda cedd cede ceeb ceec cef- cefa cefc ceke cer- cera cerc cerd cere cerf cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cfda cffb cffr cfra cfrb cfre ckac ckbc ckbe ckck cker ckfr ckrc ckrd crab crac craf crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree crfc crkc daab daad daae daar daba dabb daca dace dada dade daeb daer dafa dafc dafe daff daka dake dara darb darc dard dare darf dark darr dbar dbcc dbfc dcbc dcca dccb dccc dcdb dcfc dcra dcrk dddd ddrc ddre deac dead deae deaf deak dear deba debe dec- deca decc decd dece deck deda dedd dede deeb deed deef deek deer defe deff dek- deka deke der- dera derb derc dere derf derk derr dfaf dfcc dfer dffa dfrf dkba dkdc draa drab drac drad draf drak drar drba drbc drca drda drea dred dree dref drek drfc drra eaaf eaba eaca eacc eada eadb eadd eaec eafb eara earb eard eare ebac ebba ebbc ebbr ebcc ebed eber ebfc ecaa ecac ecad ecar ecbc ecbe ecca eccb eccc ecce ecdc ecdf eced ecef ecfa ecfc ecfr ecka ecra ecrc ecrf ecrr edac edad edar edca edda eddc edde ede- edea eder edfa edra eeca eede eeea eeee eefa eefe eeka eeke eera eerc efab efbr efca efda effa efke eka- ekab ekeb eked ekek eker ekfc ekka erad eraf erba erbb erbe erca ercc erce erda erde erdf ereb erec ered erer erfc erke erra errc erre f--k faaa faac faad faba fabd fabe faca facc face fack fada fadd fade faeb fafa fafc fafe faff fake fara farb farc fard fare fark farr fbar fcab fcar fcba fcca fccf fcda fcra fdca fead feaf feak fear feba fece feck feda fede feeb feed feek feer fefc fefe feff feke fera ferb ferc ferd fere ferk ferr ffar ffcc ffee ffff ffrr fkab frab frac frad frae frak frbc frcc frea fred free frfc kaaa kaab kaaf kaak kaar kaba kabb kabc kabd kabe kabf kabr kacb kacc kacd kace kad- kada kadd kade kadf kadr kaer kafa kafc kafe kaff kafr kaka kakc kake kakk kara karb kard kare karf kark karr kbaa kbab kbac kbad kbae kbak kbar kbba kbbb kbbc kbbd kbbe kbbf kbbk kbbr kbca kbcb kbce kbck kbcr kbdb kbde kbdf kbdr kbeb kbec kbed kbee kbef kbek kber kbfb kbfc kbff kbfk kbfr kbkb kbkf kbkk kbkr kbra kbrb kbrc kbrd kbre kbrf kbrk kcaa kcab kcac kcad kcar kcba kcbc kcbd kcbf kcbk kcbr kcca kccb kccc kccd kcck kccr kcda kcdc kcdd kcdr kcea kceb kcec kced kcee kcfa kcfb kcfc kcfd kckc kckf kckk kckr kcrc kcrr kdaa kdab kdac kdad kdae kdaf kdak kdar kdbb kdbr kdca kdcc kdcd kdce kdcr kddb kddc kddd kddf kddk kddr kdeb kdec kdef kdfc kdfr kdka kdkb kdkd kdkk kdkr kdrb kdrf kea- kead keak kear keba kebb kebc kebe kebr keca keck kecr keda kedb kedc kedd kede kedr keed keef keek keer kefa kefb kefc keff kefr keka kekb kekc keke ker- kera kerb kerc kere kerf kerk kerr kfab kfac kfar kfbc kfbk kfcd kfcf kfcr kfda kfeb kfed kfer kffa kffb kfff kffk kfka kfkb kfra kfrc kfrd kfre kfrr kkaa kkac kkar kkba kkbb kkbd kkbe kkbr kkcb kkcd kkck kkcr kkda kkdc kkdd kkea kked kkfr kkkk kkrb kkrc kkre kkrf kkrk kkrr krab krac krad krae krak krar krba krbb krbd krbe krbk krbr krca krcb krcc krcd krce krda