a-a a-b a-c aaa aab aac aag aak aao aas ab- aba abb abc abg abk abo abs ac- aca acb acc acg ack aco acs ag- aga agb agc agg agk ago ags aka akb akc akg akk ako aks aoa aob aoc aog aok aoo aos as- asa asb asc asg ask aso ass baa bab bac bag bak bao bas bba bbb bbc bbg bbk bbo bbs bca bcb bcc bcg bck bco bcs bga bgb bgc bgg bgk bgo bgs bka bkb bkc bkg bkk bko bks boa bob boc bog bok boo bos bsa bsb bsc bsg bsk bso bss c-- caa cab cac cag cak cao cas cba cbb cbc cbg cbk cbo cbs cca ccb ccc ccg cck cco ccs cga cgb cgc cgg cgo cgs cka ckb ckc cko cks co- coa cob coc cog cok coo cos csa csb csc csg csk cso css gaa gab gac gag gak gao gas gba gbc gbg gbk gbo gbs gca gcb gcc gcg gck gco gcs gga ggb ggc ggg ggo ggs gka gkb gko gks goa gob goc gog gok goo gos gsa gsb gsc gsg gsk gso gss ka- kaa kab kac kag kak kao kas kba kbb kbc kbk kbo kbs kca kcb kcc kcg kck kcs kga kgb kgc kgo kgs kkb kkc kkk kks koa kob koc kog kok koo kos ksa ksb ksc ksg ksk kso kss oaa oab oac oag oak oao oas ob- oba obb obc obg obk obo obs oc- oca ocb occ ocg ock oco ocs oga ogc ogg ogo ogs oka okb okc okg okk oko oks oo- ooa oob ooc oog ook ooo oos os- osa osb osc osg osk oso oss saa sab sac sag sak sao sas sba sbb sbc sbg sbk sbo sbs sca scb scc scg sck sco scs sga sgb sgc sgg sgk sgo sgs sk- ska skb skc skg skk sko sks soa sob soc sog sok soo sos ss- ssa ssb ssc ssg ssk sso sss

a-ak a-ok aaaa aaab aaac aaas aaba aabb aabc aaca aacb aacc aack aaco aacs aaka aaoo aasa aasc aass abaa abab abac abag abak abas abb- abba abbb abbo abbs abca abcb abcc abcs aboa abob abok aboo abos abs- absa abss acaa acab acac acag acas acba acca accc acco accs acga acgs acks acoa acog acos acsa acsc acss ag-o agac agag agao agas agba agbo agca agcc agco agga agob agog agoo agos agsa agsg akaa akao akas akca akka akko akok akos aksa aoba aoca aocs aoks aoss asaa asab asac asag asak asao asas asba asbo asc- asca ascb ascc asco aska asko asks asob asoc asog asok asos assa assc assk asso asss baaa baak baas baba babb babo babs bac- baca bacc back baco bacs baga bagg bago bags bak- baka bako baks baos basa basc bask baso bass bbas bbbb bbbs bbga bcaa bcas bcbc bcbg bcbs bcca bccc bccs bcgs bcos bcsa bcsc bcss bgca bggs boab boac boag boak boas boba bobb bobo bobs boca bock boco bocs boga bogg bogo bogs boka boko boks boob booc boog book boos bosa bosc bosk boso boss bsaa bsac bsas bscs bsgs bsos bssc c-bo caaa caab caac caas caba cabg cabo cabs cac- caca cacc cack caco caga cagg cago cags caka caos casa casb casc cask caso cass cbac cbbc cbbs cbca cbcc cbcs cbga cbgb cbka cbkg cbko cbsa cbsc ccaa ccab ccac ccag ccas ccba ccbc ccca cccb cccc cccs ccga ccgc ccgs ccob ccoc ccsa ccsg ccss cgac cgas cgcc cgcg cggs cgsb cgss ckac ckbc ckck ckco ckcs ckga ckgo ckoa ckob ckoc ckoo ckos cksa cksb ckso coag coak coas coba cobb cobo cobs coca cock coco cogo cogs cok- coka coko coob cook coos cosa cosc coso coss csaa csab csac csak csao csas cscb cscc csco cscs cska csks csob csos cssa gaas gaba gabb gabo gabs gack gaga gagg gago gags gaos gasa gasb gasc gask gaso gass gbag gbas gbbo gbbs gc-c gcaa gcbc gccc gccs gcoa gcos gcss gggg ggss goas goba gobo gobs goca goga gogo gogs goog gook goos goso goss gsab gskb gsoc gsos k-os kaaa kaab kaag kaak kaas kaba kabb kabc kabg kabo kacb kacc kaco kacs kag- kaga kagb kagc kagg kago kags kaka kakc kakk kako kaks kaoa kaoc kaog kaok kaos kas- kasa kasb kasc kask kaso kass kbaa kbab kbac kbak kbas kbba kbbb kbbc kbbg kbbk kbbo kbbs kbca kbcb kbck kbco kbcs kbga kbgb kbgg kbgo kbkb kbkg kbkk kbko kboa kbob kboc kbok kboo kbos kbsa kbsb kbsg kbsk kbso kbss kcaa kcab kcac kcas kcba kcbc kcbk kcbs kcca kccb kccc kcck kcgc kcgs kckc kckk kcko kcob kcog kcos kcsa kcsb kcsc kcsg kcss kgab kgac kgak kgas kgba kgbb kgbc kgcb kgcc kgga kggg kggo kgks kgos kgso kkaa kkac kkag kkba kkbb kkbg kkbo kkbs kkcb kkck kkco kkcs kkgb kkgo kkkk kkoa kkob kkoo kksa kkss koab koac koak koas koba kobb kobc kobk kobo kobs koca kocb kock kocs koga kogb kogg kogo koka kokb kokc kokk koko koks koob kooc koog kook kooo koos kos- kosa kosb kosc kosg koso koss ksab ksac ksak ksas ksba ksbc ksbs ksca kscb ksck ksco kscs ksgc ksgg kska kskb kskg kskk ksko ksks ksob ksoc ksok ksoo ksos kssa ksso ksss oaks oasc oass obak obas obba obbo obkb obok obos obss ocab ocac ocak ocas ocbc occa occc ocga ocks ocos ocsa ogb ogba ogoa ogog okak okas okgo okka okko okok oksa okso ooaa ooak ooba oooo ooos oosa osag osak osas osba osca oscc osco osoo osos ossa ossb osso s-os sa-c saab saac saag saak saas saba sabb sabc sabo sabs saca sacc sack saco sacs saga sagg sago sags saka sakb sakk sako saks saos sasa sasc sask saso sass sbaa sbac sbas sbbs sbca