a-ak a-be aaaa aaab aaad aaae aaaf aaar aaba aabb aabd aada aade aaea aafa aafb aafd aaff aaka aake aara aard aare abaa abab abad abae abaf abak abar abb- abba abbb abbe abbr abda abed abee aber abff abra adaa adab adad adae adak adar adba adda addd adde addr adea adeb adee ader adfa adra adre aeaf aede aeer aeka aer- aera aerd afaa afad afak afar afdb afee afek afer affa afka afkr afr- afra afre akaa akae akar aked akee aker akka akr- akra akre arab arad arae araf arak arar arba arbe arda arde ardf area ared aree aref arek arfa arfb arff arka arke arr- arra arre arrk arrr baaa baad baaf baak baar baba babb babe babr bada badb badd bade badr baed baek baer baff bak- baka bake bakr bar- bara barb bard bare barf bark barr bbad bbbb bbdd bbeb bd-r bead beaf beak bear beba bebb bebe beda bede beeb beed beef beek beer befa befe beff beka beke bera berd bere berk berr brab brad brae braf brak brda brea breb bred bree bref brek brer brka brkb brrr daab daad daae daar daba dabb dada dade daeb daer dafa dafe daff daka dake dara darb dard dare darf dark darr dbar dddd ddre dead deae deaf deak dear deba debe deda dedd dede deeb deed deef deek deer defe deff dek- deka deke der- dera derb dere derf derk derr dfaf dfer dffa dfrf dkba draa drab drad draf drak drar drba drda drea dred dree dref drek drra eaaf eaba eada eadb eadd eafb eara earb eard eare ebba ebbr ebed eber edad edar edda edde ede- edea eder edfa edra eede eeea eeee eefa eefe eeka eeke eera efab efbr efda effa efke eka- ekab ekeb eked ekek eker ekka erad eraf erba erbb erbe erda erde erdf ereb ered erer erke erra erre f--k faaa faad faba fabd fabe fada fadd fade faeb fafa fafe faff fake fara farb fard fare fark farr fbar fead feaf feak fear feba feda fede feeb feed feek feer fefe feff feke fera ferb ferd fere ferk ferr ffar ffee ffff ffrr fkab frab frad frae frak frea fred free kaaa kaab kaaf kaak kaar kaba kabb kabd kabe kabf kabr kad- kada kadd kade kadf kadr kaer kafa kafe kaff kafr kaka kake kakk kara karb kard kare karf kark karr kbaa kbab kbad kbae kbak kbar kbba kbbb kbbd kbbe kbbf kbbk kbbr kbdb kbde kbdf kbdr kbeb kbed kbee kbef kbek kber kbfb kbff kbfk kbfr kbkb kbkf kbkk kbkr kbra kbrb kbrd kbre kbrf kbrk kdaa kdab kdad kdae kdaf kdak kdar kdbb kdbr kddb kddd kddf kddk kddr kdeb kdef kdfr kdka kdkb kdkd kdkk kdkr kdrb kdrf kea- kead keak kear keba kebb kebe kebr keda kedb kedd kede kedr keed keef keek keer kefa kefb keff kefr keka kekb keke ker- kera kerb kere kerf kerk kerr kfab kfar kfbk kfda kfeb kfed kfer kffa kffb kfff kffk kfka kfkb kfra kfrd kfre kfrr kkaa kkar kkba kkbb kkbd kkbe kkbr kkda kkdd kkea kked kkfr kkkk kkrb kkre kkrf kkrk kkrr krab krad krae krak krar krba krbb krbd krbe krbk krbr krda krdd krde krdr krea kreb kred kree kref krek krfd krfe krff krka krkd krke krkk krkr krrb krre krrf krrk krrr raab raad raaf raak raba rabb rabe rabk rada radd rade radr raed raef raer rafa rafe raff raka rake rakk rara rarb rare rarf rark rbaf rbbb rbbr rder rdfa rea- read reae reaf reak rear reba rebb rebe rebk reda redd rede redr reeb reed reef reek refd refe reff refr reka reke rera rerd rere rfae rfef rkkf rrad rred rrrr