a-a a-b a-c aaa aab aac aae aaf aak aao ab- aba abb abc abe abf abk abo ac- aca acb acc ace acf ack aco aea aeb aec aee aef aek aeo af- afa afb afc afe aff afk afo aka akb akc ake akk ako aoa aob aoc aoe aof aok aoo baa bab bac bae baf bak bao bba bbb bbc bbe bbf bbk bbo bca bcb bcc bce bcf bck bco be- bea beb bec bee bef bek beo bfa bfb bfc bfe bff bfo bka bkb bkc bke bkf bkk bko boa bob boc boe bof bok boo c-- caa cab cac cae caf cak cao cba cbb cbc cbe cbf cbk cbo cca ccb ccc cce ccf cck cco ce- cea ceb cec cee cef cek ceo cfa cfb cfc cfe cff cfk cfo cka ckb ckc cko co- coa cob coc coe cof cok coo eaa eab eac eae eaf eak eao eba ebb ebc ebe ebf ebk ebo ec- eca ecb ecc ece ecf eck eco eea eeb eec eee eef eek eeo ef- efa efb efc efe eff efo eka ekb ekc eke ekf eko eo- eoa eob eoc eoe eof eok eoo faa fab fac fae faf fak fao fba fbb fbc fbe fbf fbk fbo fca fcb fcc fce fcf fck fco fea feb fec fee fef fek feo ffa ffc ffe fff ffk ffo fka fkb fkc fkf fkk foa fob foc foe fof fok foo ka- kaa kab kac kae kaf kak kao kba kbb kbc kbe kbf kbk kbo kca kcb kcc kce kck ke- kea keb kec kee kef kek keo kfa kfc kff kfo kkb kkc kke kkk koa kob koc koe kof kok koo oaa oab oac oae oaf oak oao ob- oba obb obc obe obf obk obo oc- oca ocb occ ocf ock oco oea oeb oec oee oef oeo of- ofa ofb ofc ofe off ofo oka okb okc oke okk oko oo- ooa oob ooc oof ook ooo

a-ak a-be a-ok aaaa aaab aaac aaae aaaf aaba aabb aabc aaca aacb aacc aace aacf aack aaco aaea aaec aafa aafb aafc aaff aaka aake aaoe aaoo abaa abab abac abae abaf abak abb- abba abbb abbe abbo abca abcb abcc abcf abec abee abff aboa abob abof abok aboo acaa acab acac acae acba acca accc acce accf acco ace- acea acec acek acfc acfe acke acoa acoe aeac aeaf aecb aeka afaa afak afao afca afcb afcc afee afek affa affc affo afka afoa afoe afoo akaa akae akao akca akee akka akko akok aoba aoca aoce baaa baaf baak baba babb babe babo bac- baca bacc bace back baco baek bafc baff bafo bak- baka bake bako bbbb bbeb bbfc bcaa bcbc bcca bccc bcec bcfc bcof beaf beak beba bebb bebe bebo beca beck beeb beef beek befa befe beff befo beka beke beko beo- beof beok bfca boab boac boak boba bobb bobe bobo boca boce bock boco boea boec boee boef boeo bofa bofe boff boka boke boko boob booc booe boof book c-bo caaa caab caac caaf caba cabe cabf cabo cac- caca cacc cace cack caco caec cafa cafb cafc cafe caff caka cake cbac cbbc cbca cbcc cbce cbea cbec cbee cbef cbfb cbfc cbka cbko ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf ccee ccfa ccfc ccff ccob ccoc ceac ceba cec- ceca cece ceco ceeb ceec cef- cefa cefc ceke cfaa cfab cfac cfae cfao cfbc cfca cfcb cfcf cfco cffb cfoa ckac ckbc ckbe ckck ckco ckoa ckob ckoc ckoo coak coba cobb cobe cobo coca coce cock coco cofc cofe coff cok- coka coke coko coob coof cook eaaf eaba eaca eacc eaec eafb ebac ebba ebbc ebbo ebcc ebfc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco ecef ecfa ecfc ecka ecko eco- eeca eeea eeee eefa eefe eeka eeke eeoc efab efca efco efeo effa efke eka- ekab ekco ekeb ekek ekfc ekka ekoa eoka f--k faaa faac faba fabe fabo faca facc face fack faeb fafa fafc fafe faff fafo fake fako fcab fcba fcca fccf feaf feak feba febo fece feck feeb feek fefc fefe feff fefo feke feko feof ffcc ffee ffff fkab foaf foak foba foca foce fock foco fofo foke foof fook kaaa kaab kaaf kaak kaba kabb kabc kabe kabf kabo kacb kacc kace kaco kaeo kafa kafc kafe kaff kaka kakc kake kakk kako kaoa kaoc kaok kbaa kbab kbac kbae kbak kbba kbbb kbbc kbbe kbbf kbbk kbbo kbca kbcb kbce kbck kbco kbeb kbec kbee kbef kbek kbeo kbfb kbfc kbff kbfk kbfo kbkb kbkf kbkk kbko kboa kbob kboc kboe kbok kboo kcaa kcab kcac kcba kcbc kcbf kcbk kcca kccb kccc kcck kcea kceb kcec kcee kceo kcfa kcfb kcfc kcfo kckc kckf kckk kcko kcob kcoe kcof kea- keak keba kebb kebc kebe keca keck keco keef keek kefa kefb kefc keff keka kekb kekc keke keko keok kfab kfac kfbc kfbk kfcf kfco kfeb kffa kffb kfff kffk kfka kfkb kfok kfoo kkaa kkac kkba kkbb kkbe kkbo kkcb kkck kkco kkea kkkk kkoa kkob kkoo koab koac koae koak koba kobb kobc kobe kobk kobo koca kocb kocf kock koea kofa kofc kofe koff kofk kofo koka kokb kokc koke kokf kokk koko koob kooc kook kooo o-eo oafc oafo oake obak obba obbo obea obec obkb oboe obok ocab ocac ocak ocbc occa occc oce ocee ocef ocfa ocke oec- oeca oecc oeec ofek off- offa offc offe offo okak okka okko okok ooaa ooak ooba oobe ooff oooo

-aaa- aaace aaaee aaaoc aabaa aabba aacbc aacfo aaeaf aakko abaab ababa ababe abaca aback abaco abaka abake abako abbac abccc abeba abebe abece abfab abkoo aboab abobo aboke abook acaca acacb acack acake aceae acebo aceof ackee acock acoke acook aeaea aebbe aface afcea afcec afefe afeka aka-e akaba akabo akaoa akce akobo akoka