-er a-a a-b aaa aab aae aaf aak aao aar ab- aba abb abe abf abk abo abr aea aeb aee aef aek aeo aer af- afa afb afe aff afk afo afr aka akb ake akk ako akr aoa aob aoe aof aok aoo aor ar- ara arb are arf ark aro arr baa bab bae baf bak bao bar bba bbb bbe bbf bbk bbo bbr be- bea beb bee bef bek beo ber bfa bfb bfe bff bfo bfr bka bkb bke bkf bkk bko bkr boa bob boe bof bok boo bor bra brb bre brf brk bro brr eaa eab eae eaf eak eao ear eba ebb ebe ebf ebk ebo ebr eea eeb eee eef eek eeo eer ef- efa efb efe eff efo efr eka ekb eke ekf eko ekr eo- eoa eob eoe eof eok eoo eor era erb ere erf erk ero err faa fab fae faf fak fao far fba fbb fbe fbf fbk fbo fbr fea feb fee fef fek feo fer ffa ffe fff ffk ffo ffr fka fkb fkf fkk foa fob foe fof fok foo for fra frb fre frf frk fro frr ka- kaa kab kae kaf kak kao kar kba kbb kbe kbf kbk kbo kbr ke- kea keb kee kef kek keo ker kfa kff kfo kkb kke kkk kkr koa kob koe kof kok koo kor kra krf krk kro krr oaa oab oae oaf oak oao oar ob- oba obb obe obf obk obo obr oea oeb oee oef oeo oer of- ofa ofb ofe off ofo ofr oka okb oke okk oko okr oo- ooa oob oof ook ooo oor or- ora orb ore orf ork oro orr ra- raa rab rae raf rak rao rar rba rbb rbe rbf rbk rbo rbr re- rea reb ree ref rek reo rer rfa rfb rfe rff rfk rfo rfr rkb rke rkf rkk rko roa rob roe rof rok roo ror rra rrb rrf rrk rrr

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