a-ak a-be a-ok aaaa aaab aaae aaaf aaar aaba aabb aaea aafa aafb aaff aaka aake aaoe aaoo aara aare aaro abaa abab abae abaf abak abar abb- abba abbb abbe abbo abbr abee aber abff aboa abob abof abok aboo abor abra abro aeaf aeer aeka aer- aera aero afaa afak afao afar afee afek afer affa affo afka afkr afoa afoe afoo afor afr- afra afre afro akaa akae akao akar akee aker akka akko akok akr- akra akre aoba aora aorb arab arae araf arak arar arba arbe area aree aref arek areo arfa arfb arff arka arke arko aroa arob aroe aroo aror arr- arra arre arrk arro arrr baaa baaf baak baar baba babb babe babo babr baek baer baff bafo bak- baka bake bako bakr bar- bara barb bare barf bark baro barr bbbb bbeb beaf beak bear beba bebb bebe bebo beeb beef beek beer befa befe beff befo beka beke beko beo- beof beok beor bera bere berk bero berr boab boak boar boba bobb bobe bobo boea boee boef boeo boer bofa bofe boff boka boke boko boob booe boof book boor bor- bora bore borf bork boro borr brab brae braf brak brao brea breb bree bref brek breo brer brka brkb broa brob broe brok broo bror brrr eaaf eaba eafb eara earb eare earo ebba ebbo ebbr eber eboe eboo ebor ebro eeea eeee eefa eefe eeka eeke eera eero efab efbr efeo effa efke efor eka- ekab ekeb ekek eker ekka ekoa eoka eora eore eraf erba erbb erbe ereb erer erke erob eroe eroo erra erre erro f--k faaa faba fabe fabo faeb fafa fafe faff fafo fake fako fara farb fare fark faro farr fbar feaf feak fear feba febo feeb feek feer fefe feff fefo feke feko feof fera ferb fere ferk fero ferr ffar ffee ffff ffrr fkab foaf foak foar foba foer fofo foke foof fook for- fora forb fore fork foro forr frab frae frak frea free freo frob froe kaaa kaab kaaf kaak kaar kaba kabb kabe kabf kabo kabr kaeo kaer kafa kafe kaff kafr kaka kake kakk kako kaoa kaok kaor kara karb kare karf kark karo karr kbaa kbab kbae kbak kbar kbba kbbb kbbe kbbf kbbk kbbo kbbr kbeb kbee kbef kbek kbeo kber kbfb kbff kbfk kbfo kbfr kbkb kbkf kbkk kbko kbkr kboa kbob kboe kbok kboo kbra kbrb kbre kbrf kbrk kbro kea- keak kear keba kebb kebe kebr keef keek keer kefa kefb keff kefr keka kekb keke keko keok ker- kera kerb kere kerf kerk kero kerr kfab kfar kfbk kfeb kfer kffa kffb kfff kffk kfka kfkb kfok kfoo kfor kfra kfre kfro kfrr kkaa kkar kkba kkbb kkbe kkbo kkbr kkea kkfr kkkk kkoa kkob kkoo kkor kkrb kkre kkrf kkrk kkro kkrr koab koae koak koar koba kobb kobe kobk kobo kobr koea kofa kofe koff kofk kofo koka kokb koke kokf kokk koko kokr koob kook kooo koor kora korb kore korf kork koro korr krab krae krak krar krba krbb krbe krbk krbr krea kreb kree kref krek kreo krfe krff krfo krka krke krkk krko krkr kroa krob kroe krof krok kroo kror krrb krre krrf krrk krro krrr o-eo oaer oafo oake oara oare obak obba obbo obea ober obkb oboe obok obor obra obre obro oera oere ofek ofer off- offa offe offo offr ofor ofra ofre okak oker okka okko okok okor okra okre okro ooaa ooak ooba oobe ooer ooff oooo oora oore orab orae orak orao orar orba orbb orbe orbo ore- orea oreb orek oreo orer orfe orff orka orke orko oro- oroe orof orok oror orra orro raab raaf raak raba rabb rabe rabk rabo raef raer rafa rafe raff raka rake rakk raob raok rara rarb rare rarf rark raro rbaf rbbb rbbr rea- reae reaf reak reao rear reba rebb rebe rebk rebo reeb reef reek refe reff refr reka reke reko reof rera rere rero rfae rfef rkkf roab roaf roak roar rob- roba robb robe robo roea roer rofe roff rofo roka roke rokk roko rokr roob roof rook roor rora rore rork roro rrrr