a-a a-b a-c a-t aaa aab aac aaf aak aao aat ab- aba abb abc abf abk abo abt ac- aca acb acc acf ack aco act af- afa afb afc aff afk afo aft aka akb akc akk ako aoa aob aoc aof aok aoo aot at- ata atb atc atf ato att baa bab bac baf bak bao bat bba bbb bbc bbf bbk bbo bbt bca bcb bcc bcf bck bco bct bfa bfb bfc bff bfo bft bka bkb bkc bkf bkk bko bkt boa bob boc bof bok boo bot bta btb btc btf btk bto btt c-- caa cab cac caf cak cao cat cba cbb cbc cbf cbk cbo cbt cca ccb ccc ccf cck cco cct cfa cfb cfc cff cfk cfo cft cka ckb ckc cko ckt co- coa cob coc cof cok coo cot cta ctb ctc ctf ctk cto ctt faa fab fac faf fak fao fat fba fbb fbc fbf fbk fbo fbt fca fcb fcc fcf fck fco fct ffa ffc fff ffk ffo fft fka fkb fkc fkf fkk fkt foa fob foc fof fok foo fot fta ftb ftc ftf ftk fto ftt k-t ka- kaa kab kac kaf kak kao kat kba kbb kbc kbf kbk kbo kca kcb kcc kck kct kfa kfc kff kfo kkb kkc kkk kkt koa kob koc kof kok koo kot kta ktb ktc ktf ktk kto ktt oaa oab oac oaf oak oao oat ob- oba obb obc obf obk obo obt oc- oca ocb occ ocf ock oco oct of- ofa ofb ofc off ofo oft oka okb okc okk oko oo- ooa oob ooc oof ook ooo oot ot- ota otb otc otf otk oto ott taa tab tac taf tak tao tat tba tbb tbc tbf tbk tbo tbt tca tcb tcc tcf tck tco tct tfa tfb tfc tff tfk tfo tft tka tkb tkc tkk tko tkt to- toa tob toc tof tok too tot tta ttb ttc ttf ttk tto ttt

a-ak a-ok aaaa aaab aaac aaaf aaba aabb aabc aabt aaca aacb aacc aacf aack aaco aact aafa aafb aafc aaff aaka aaoo aata aatc aatf aatk aatt abaa abab abac abaf abak abat abb- abba abbb abbo abbt abca abcb abcc abcf abct abff aboa abob abof abok aboo abot abta ac-t acaa acab acac acat acba acca accc accf acco acct acfc acft acoa acot acta actc actf acto actt afaa afak afao afat afca afcb afcc affa affc affo afft afka afoa afoo afta aftc akaa akao akca akka akko akok akot aoba aoca aotc aotf at-t ataa atab atac atak atat atca atcc atcf atck atco atfb atfc atka atkt atob atoc atof atok atot atta atto baaa baaf baak baat baba babb babo bac- baca bacc back baco bact bafc baff bafo baft bak- baka bako bakt bata batc batf bato batt bbbb bbfc bcaa bcat bcbc bcca bccc bcfc bcof bctc bfca bfta bftt boab boac boak boat boba bobb bobo boca bock boco bofa boff boka boko boob booc boof book boot bota botb boto bott btaa btaf btcc btfc btob bttb c-bo caaa caab caac caaf caat caba cabf cabo cac- caca cacc cack caco cafa cafb cafc caff caka cat- cata catb catc catf cato catt cbac cbat cbbc cbca cbcc cbct cbfb cbfc cbka cbko cbot cbta cbtc cbtf ccaa ccab ccac ccaf ccat ccba ccbc ccca cccb cccc cccf ccfa ccfc ccff ccob ccoc cctb cctc cctt cfaa cfab cfac cfao cfbc cfbt cfca cfcb cfcf cfco cffb cfoa cfta cftc cftk ckac ckat ckbc ckck ckco ckoa ckob ckoc ckoo ckot cktb coak coat coba cobb cobo coca cock coco coct cofc coff coft cok- coka coko coob coof cook coot cota cotb cotc coto cott ctab ctba ctca ctcf ctfc ctfo ctot ctta f--k faaa faac faba fabo faca facc fack fact fafa fafc faff fafo fako fakt fata fatc fatf fato fatt fcab fcat fcba fcca fccf fcot fcto ffcc ffff fftf fkab foaf foak foba fobt foca fock foco fofo foof fook foot fota foto fott ft-c ftfc kaaa kaab kaaf kaak kaat kaba kabb kabc kabf kabo kacb kacc kaco kact kafa kafc kaff kaka kakc kakk kako kakt kaoa kaoc kaok kat- kata katb katc katf katk kato katt kbaa kbab kbac kbak kbat kbba kbbb kbbc kbbf kbbk kbbo kbbt kbca kbcb kbck kbco kbct kbfb kbfc kbff kbfk kbfo kbft kbkb kbkf kbkk kbko kboa kbob kboc kbok kboo kbot kbta kbtb kbtc kbtf kbtk kbto kbtt kcaa kcab kcac kcat kcba kcbc kcbf kcbk kcca kccb kccc kcck kcct kcfa kcfb kcfc kcfo kcft kckc kckf kckk kcko kcob kcof kcot kcta kctb kctc kcto kfab kfac kfat kfbc kfbk kfbt kfcf kfco kffa kffb kfff kffk kfka kfkb kfok kfoo kfta kftc kftk kftt kkaa kkac kkat kkba kkbb kkbo kkbt kkcb kkck kkco kkct kkft kkkk kkoa kkob kkoo kkot kktc kktk koab koac koak koba kobb kobc kobk kobo koca kocb kocf kock koct kofa kofc koff kofk kofo koft koka kokb kokc kokf kokk koko koob kooc kook kooo koot kota kotb kotc kotk koto kott ktaa ktak ktao ktat ktba ktbb ktbc ktbt ktcc ktck ktco ktfb ktfc ktfo ktkb ktkc ktkk ktko ktkt ktob ktoc ktok ktoo ktot kttc kttf kttk ktto kttt oafc oafo obak obba obbo obkb obok obot ocab ocac ocak ocat ocbc occa occc occt ocfa oct- octa octo off- offa offc offo ofta okak okka okko okok okot okta okto ooaa ooak ooba ooff oooo ootb otac otak otfc oto- otof otok otoo otta otto taa- taaf taat taba tabb tabc tabo taca tacc tack taco tact tafa tafc taff tafo taft taka takk tako takt taoa tata tatb tato tatt tbaf tbca tbcb tbcc tbta tcca tccc tcfc tctc tfca tfot tftc tkac tkof toab toat toba tobo tobt toca tock toco tofa toff tofo toft toka toko