a-a a-b a-c a-t aaa aab aac aaf aak aao aas aat ab- aba abb abc abf abk abo abs abt ac- aca acb acc acf ack aco acs act af- afa afb afc aff afk afo afs aft aka akb akc akk ako aks aoa aob aoc aof aok aoo aos aot as- asa asb asc asf ask aso ass ast at- ata atb atc atf ato ats att baa bab bac baf bak bao bas bat bba bbb bbc bbf bbk bbo bbs bbt bca bcb bcc bcf bck bco bcs bct bfa bfb bfc bff bfo bfs bft bka bkb bkc bkf bkk bko bks bkt boa bob boc bof bok boo bos bot bsa bsb bsc bsf bsk bso bss bst bta btb btc btf btk bto bts btt c-- caa cab cac caf cak cao cas cat cba cbb cbc cbf cbk cbo cbs cbt cca ccb ccc ccf cck cco ccs cct cfa cfb cfc cff cfk cfo cfs cft cka ckb ckc cko cks ckt co- coa cob coc cof cok coo cos cot csa csb csc csf csk cso css cst cta ctb ctc ctf ctk cto cts ctt faa fab fac faf fak fao fas fat fba fbb fbc fbf fbk fbo fbs fbt fca fcb fcc fcf fck fco fcs fct ffa ffc fff ffk ffo ffs fft fka fkb fkc fkf fkk fkt foa fob foc fof fok foo fos fot fsa fsb fsc fsf fsk fso fss fst fta ftb ftc ftf ftk fto fts ftt k-t ka- kaa kab kac kaf kak kao kas kat kba kbb kbc kbf kbk kbo kbs kca kcb kcc kck kcs kct kfa kfc kff kfo kfs kkb kkc kkk kks kkt koa kob koc kof kok koo kos kot ksa ksb ksc ksf ksk kso kss kst kta ktb ktc ktf ktk kto kts ktt oaa oab oac oaf oak oao oas oat ob- oba obb obc obf obk obo obs obt oc- oca ocb occ ocf ock oco ocs oct of- ofa ofb ofc off ofo ofs oft oka okb okc okk oko oks oo- ooa oob ooc oof ook ooo oos oot os- osa osb osc osf osk oso oss ost ot- ota otb otc otf otk oto ots ott saa sab sac saf sak sao sas sat sba sbb sbc sbf sbk sbo sbs sbt sca scb scc scf sck sco scs sct sfa sfb sfc sff sfk sfo sfs sft sk- ska skb skc skf skk sko sks skt soa sob soc sof sok soo sos sot ss- ssa ssb ssc ssf ssk sso sss sst sta stb stc stf stk sto sts stt taa tab tac taf tak tao tas tat tba tbb tbc tbf tbk tbo tbs tbt tca tcb tcc tcf tck tco tcs tct tfa tfb tfc tff tfk tfo tfs tft tka tkb tkc tkk tko tks tkt to- toa tob toc tof tok too tos tot tsa tsb tsc tsf tsk tso tss tst tta ttb ttc ttf ttk tto tts ttt

a-ak a-ok aaaa aaab aaac aaaf aaas aaba aabb aabc aabt aaca aacb aacc aacf aack aaco aacs aact aafa aafb aafc aaff aaka aaoo aasa aasc aasf aass aast aata aatc aatf aatk aatt abaa abab abac abaf abak abas abat abb- abba abbb abbo abbs abbt abca abcb abcc abcf abcs abct abff aboa abob abof abok aboo abos abot abs- absa absf abss abta abts ac-t acaa acab acac acas acat acba acca accc accf acco accs acct acfc acfs acft acks acoa acos acot acsa acsc acss acst acta actc actf acto acts actt afaa afak afao afat afbs afca afcb afcc afcs affa affc affo affs afft afka afoa afoo afsa afsb afsc afst afta aftc afts akaa akao akas akca akka akko akok akos akot aksa akst aoba aoca aocs aoks aoss aotc aotf asaa asab asac asaf asak asao asas asat asba asbo asc- asca ascb ascc asco asct asfa aska asko asks askt asob asoc asof asok asos asot assa assc assk asso asss asst asta astb astc asto asts at-t ataa atab atac atak atas atat atbs atca atcc atcf atck atco atcs atfb atfc atfs atka atkt atob atoc atof atok atos atot atsb atsc atst atta atto atts baaa baaf baak baas baat baba babb babo babs bac- baca bacc back baco bacs bact bafc baff bafo baft bak- baka bako baks bakt baos basa basc basf bask baso bass bast bata batc batf bato bats batt bbas bbbb bbbs bbfc bcaa bcas bcat bcbc bcbs bcca bccc bccs bcfc bcof bcos bcsa bcsc bcss bctc bcts bfas bfca bfcs bffs bfta bfts bftt boab boac boak boas boat boba bobb bobo bobs boca bock boco bocs bofa boff bofs boka boko boks boob booc boof book boos boot bosa bosc bosk boso boss bost bota botb boto bots bott bsaa bsac bsas bsat bscs bsfa bsfc bsff bsfs bskt bsos bssc bsts btaa btaf btcc btcs btfc btob btss bttb c-bo caaa caab caac caaf caas caat caba cabf cabo cabs cac- caca cacc cack caco cafa cafb cafc caff cafs caka caos casa casb casc cask caso cass cast cat- cata catb catc catf cato cats catt cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbfb cbfc cbka cbko cbot cbsa cbsc cbta cbtc cbtf ccaa ccab ccac ccaf ccas ccat ccba ccbc ccca cccb cccc cccf cccs ccfa ccfc ccff ccob ccoc ccsa ccsf ccss ccst cctb cctc cctt cfaa cfab cfac cfao cfbc cfbs cfbt cfca cfcb cfcf cfco cfcs cffb cfoa cfos cfsa cfta cftc cftk ckac ckat ckbc ckck ckco ckcs ckoa ckob ckoc ckoo ckos ckot cksa cksb ckso ckst cktb ckts coak coas coat coba cobb cobo cobs coca cock coco coct cofc coff cofs coft cok- coka coko coob coof cook coos coot cosa cosc coso coss cost cota cotb cotc coto cots cott csaa csab csac csak