a-a a-b aaa aab aad aaf aak aao aar ab- aba abb abd abf abk abo abr ad- ada adb add adf adk ado adr af- afa afb afd aff afk afo afr aka akb akd akk ako akr aoa aob aod aof aok aoo aor ar- ara arb ard arf ark aro arr baa bab bad baf bak bao bar bba bbb bbd bbf bbk bbo bbr bda bdb bdd bdf bdk bdo bdr bfa bfb bfd bff bfo bfr bka bkb bkf bkk bko bkr boa bob bod bof bok boo bor bra brb brd brf brk bro brr daa dab dad daf dak dao dar dba dbb dbd dbf dbk dbo dbr dda ddb ddd ddf ddk ddo ddr dfa dfb dfd dff dfk dfo dfr dka dkb dkk dko dkr doa dob dod dof dok doo dor dra drb drd drk dro drr faa fab fad faf fak fao far fba fbb fbd fbf fbk fbo fbr fda fdb fdd fdf fdk fdo fdr ffa ffd fff ffk ffo ffr fka fkb fkf fkk foa fob fof fok foo for fra frb frd frf frk fro frr ka- kaa kab kad kaf kak kao kar kba kbb kbd kbf kbk kbo kbr kda kdb kdf kdk kdo kdr kfa kfd kff kfo kkb kkk kkr koa kob kod kof kok koo kor kra krd krf krk kro krr oaa oab oad oaf oak oao oar ob- oba obb obd obf obk obo obr oda odb odd odf odo odr of- ofa ofb ofd off ofo ofr oka okb okd okk oko okr oo- ooa oob ood oof ook ooo oor or- ora orb ord orf ork oro orr ra- raa rab rad raf rak rao rar rba rbb rbd rbf rbk rbo rbr rda rdb rdd rdf rdo rdr rfa rfb rfd rff rfk rfo rfr rkb rkf rkk rko roa rob rod rof rok roo ror rra rrb rrd rrf rrk rrr

a-ak a-do a-ok aaaa aaab aaad aaaf aaar aaba aabb aabd aada aafa aafb aafd aaff aaka aaoo aara aard aaro abaa abab abad abaf abak abar abb- abba abbb abbo abbr abda abdo abff aboa abob abod abof abok aboo abor abra abro adaa adab adad adak adao adar adba adda addd addo addr adfa adob adod adok adoo ador adra adro afaa afad afak afao afar afdb affa affo afka afkr afoa afoo afor afr- afra afro akaa akao akar akka akko akok akr- akra aoba aora aorb arab arad araf arak arar arba arda ardf ardo arfa arfb arff arka arko aroa arob arod aroo aror arr- arra arrk arro arrr baaa baad baaf baak baar baba babb babo babr bada badb badd bado badr baff bafo bak- baka bako bakr bar- bara barb bard barf bark baro barr bbad bbbb bbdd bbdo bd-r boab boad boak boar boba bobb bobo boda bodb bodo bofa bofd boff boka boko boob bood boof book boor bor- bora bord borf bork boro borr brab brad braf brak brao brda brdo brka brkb broa brob brod brok broo bror brrr d-bo daab daad daar daba dabb dabo dada dado dafa daff dafo daka dako dara darb dard darf dark daro darr dbar dbfo dddd dfaf dffa dfrf dkba doab doak doar doba dobb dod- doda dodd dodo doff doka doko doob dood doof dook door dora dord dorf dork doro dorr draa drab drad draf drak drar drba drda drob drod drof drra f--k faaa faad faba fabd fabo fada fadd fado fafa faff fafo fako fara farb fard fark faro farr fbar fdoa ffar ffff ffrr fkab foad foaf foak foar foba foda fofo food foof fook for- fora forb ford fork foro forr frab frad frak frob kaaa kaab kaaf kaak kaar kaba kabb kabd kabf kabo kabr kad- kada kadd kadf kado kadr kafa kaff kafr kaka kakk kako kaoa kaok kaor kara karb kard karf kark karo karr kbaa kbab kbad kbak kbar kbba kbbb kbbd kbbf kbbk kbbo kbbr kbdb kbdf kbdo kbdr kbfb kbff kbfk kbfo kbfr kbkb kbkf kbkk kbko kbkr kboa kbob kbod kbok kboo kbra kbrb kbrd kbrf kbrk kbro kdaa kdab kdad kdaf kdak kdao kdar kdbb kdbr kddb kddd kddf kddk kddr kdfo kdfr kdka kdkb kdkd kdkk kdko kdkr kdok kdrb kdrf kdro kfab kfar kfbk kfda kffa kffb kfff kffk kfka kfkb kfok kfoo kfor kfra kfrd kfro kfrr kkaa kkar kkba kkbb kkbd kkbo kkbr kkda kkdd kkdo kkfr kkkk kkoa kkob kkoo kkor kkrb kkrf kkrk kkro kkrr koab koak koar koba kobb kobk kobo kobr koda kodk kodo kofa koff kofk kofo koka kokb kokf kokk koko kokr koob kook kooo koor kora korb kord korf kork koro korr krab krad krak krar krba krbb krbd krbk krbr krda krdd krdo krdr krfd krff krfo krka krkd krkk krko krkr kroa krob krod krof krok kroo kror krrb krrf krrk krro krrr oafo oara obad obak obba obbo obkb obok obor obra obro odbo odda oddd odoo odor odra ofdr off- offa offo offr ofor ofra okak okka okko okok okor okra okro ooaa ooak ooba ooda ooff oooo oora oord orab orad orak orao orar orba orbb orbo orda ordo orff orka orko oro- orof orok oror orra orro raab raad raaf raak raba rabb rabk rabo rada radd rado radr rafa raff raka rakk raob raok rara rarb rarf rark raro rbaf rbbb rbbr rdfa rkkf roab road roaf roak roar rob- roba robb robo roda rodd rodo roff rofo roka rokk roko rokr roob rood roof rook roor rora rork roro rrad rrrr

-aaa- -abad aabaa aabba aabra aakko abaab ababa abada abaka abako abara abbad abbar abbod abfab abkar abkoo aboab aboad abobo abood abook abora abord abrad abrak abrar abrod adaba adada adado adaka adara adark adaro addra adkar adoar adobo adodb adoor adora adorf adoro adrad adrar adroa afara affor afork afro- afrob akaba akabo akaoa akard akbar akkad akkra akobo