a-a a-b a-c a-t aaa aab aac aaf aak aao aar aat ab- aba abb abc abf abk abo abr abt ac- aca acb acc acf ack aco acr act af- afa afb afc aff afk afo afr aft aka akb akc akk ako akr aoa aob aoc aof aok aoo aor aot ar- ara arb arc arf ark aro arr art at- ata atb atc atf ato atr att baa bab bac baf bak bao bar bat bba bbb bbc bbf bbk bbo bbr bbt bca bcb bcc bcf bck bco bcr bct bfa bfb bfc bff bfo bfr bft bka bkb bkc bkf bkk bko bkr bkt boa bob boc bof bok boo bor bot bra brb brf brk bro brr brt bta btb btc btf btk bto btr btt c-- caa cab cac caf cak cao car cat cba cbb cbc cbf cbk cbo cbr cbt cca ccb ccc ccf cck cco ccr cct cfa cfb cfc cff cfk cfo cfr cft cka ckb ckc cko ckt co- coa cob coc cof cok coo cor cot cra crb crc crf crk cro crr crt cta ctb ctc ctf ctk cto ctr ctt faa fab fac faf fak fao far fat fba fbb fbc fbf fbk fbo fbr fbt fca fcb fcc fcf fck fco fcr fct ffa ffc fff ffk ffo ffr fft fka fkb fkc fkf fkk fkt foa fob foc fof fok foo for fot fra frb frc frf frk fro frr frt fta ftb ftc ftf ftk fto ftr ftt k-t ka- kaa kab kac kaf kak kao kar kat kba kbb kbc kbf kbk kbo kbr kca kcb kcc kck kcr kct kfa kfc kff kfo kkb kkc kkk kkr kkt koa kob koc kof kok koo kor kot kra krc krf krk kro krr krt kta ktb ktc ktf ktk kto ktr ktt oaa oab oac oaf oak oao oar oat ob- oba obb obc obf obk obo obr obt oc- oca ocb occ ocf ock oco ocr oct of- ofa ofb ofc off ofo ofr oft oka okb okc okk oko okr oo- ooa oob ooc oof ook ooo oor oot or- ora orb orc orf ork oro orr ort ot- ota otb otc otf otk oto otr ott ra- raa rab rac raf rak rao rar rat rba rbb rbc rbf rbk rbo rbr rbt rca rcb rcc rcf rco rcr rct rfa rfb rfc rff rfk rfo rfr rft rkb rkc rkf rkk rko rkt roa rob roc rof rok roo ror rot rra rrb rrc rrf rrk rrr rrt rta rtb rtc rtf rtk rto rtr rtt taa tab tac taf tak tao tar tat tba tbb tbc tbf tbk tbo tbr tbt tca tcb tcc tcf tck tco tcr tct tfa tfb tfc tff tfk tfo tfr tft tka tkb tkc tkk tko tkr tkt to- toa tob toc tof tok too tor tot tra trb trc trf trk tro trr trt tta ttb ttc ttf ttk tto ttr ttt

a-ak a-ok aaaa aaab aaac aaaf aaar aaba aabb aabc aabt aaca aacb aacc aacf aack aaco aacr aact aafa aafb aafc aaff aaka aaoo aara aarc aaro aart aata aatc aatf aatk aatt abaa abab abac abaf abak abar abat abb- abba abbb abbo abbr abbt abca abcb abcc abcf abcr abct abff aboa abob abof abok aboo abor abot abra abrc abro abta ac-t acaa acab acac acar acat acba acca accc accf acco acct acfc acft acoa acor acot acr- acra acrc acro acrr acta actc actf acto actt afaa afak afao afar afat afca afcb afcc affa affc affo afft afka afkr afoa afoo afor afr- afra afrc afro afta aftc akaa akao akar akca akka akko akok akot akr- akra aoba aoca aora aorb aort aotc aotf arab arac araf arak arar arat arba arc- arca arco arct arfa arfb arfc arff arft arka arko aroa arob aroo aror arr- arra arrc arrk arro arrr arrt arta artc arto artr at-t ataa atab atac atak atar atat atca atcc atcf atck atco atcr atfb atfc atka atkt atob atoc atof atok ator atot atra atrc atrk atro atta atto attr baaa baaf baak baar baat baba babb babo babr bac- baca bacc back baco bact bafc baff bafo baft bak- baka bako bakr bakt bar- bara barb barc barf bark baro barr bart bata batc batf bato batt bbbb bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcfc bcof bcor bcra bctc bfca bfta bftt boab boac boak boar boat boba bobb bobo boca bock boco bofa boff boka boko boob booc boof book boor boot bor- bora borf bork boro borr bort bota botb boto bott brab brac braf brak brao brat brca brcb brfc brka brkb broa brob broc brok broo bror brot brrr brtc btaa btaf btcc btfc btob btor btrc btrt bttb c-bo caaa caab caac caaf caat caba cabf cabo cac- caca cacc cack caco cacr cafa cafb cafc caff caka caor cara carb carc carf cark caro carr cart cat- cata catb catc catf cato catt cbac cbar cbat cbbc cbca cbcc cbcr cbct cbfb cbfc cbka cbko cbkr cbot cbrt cbta cbtc cbtf ccaa ccab ccac ccaf ccar ccat ccba ccbc ccca cccb cccc cccf ccfa ccfc ccff ccob ccoc ccra ccrc ccrf ccrt cctb cctc cctt cfaa cfab cfac cfao cfar cfbc cfbr cfbt cfca cfcb cfcf cfco cffb cffr cfoa cfor cfra cfrb cfrt cfta cftc cftk cftr ckac ckat ckbc ckck ckco ckfr ckoa ckob ckoc ckoo ckor ckot ckrc cktb coak coat coba cobb cobo coca cock coco coct cofc coff coft cok- coka coko coob coof cook coot cor- cora corb corc corf cork coro corr cort cota cotb cotc coto cott crab crac craf crar crat crbc crca crcc crcr crfc crkc crob croc crok croo cror crot crrt crtc crtf ctab ctba ctca ctcf ctfc ctfo ctor ctot ctrc ctta f--k faaa faac faba fabo faca facc fack