a-a a-b a-c aaa aab aac aag aar aas aau ab- aba abb abc abg abr abs abu ac- aca acb acc acg acr acs acu ag- aga agb agc agg agr ags agu ar- ara arb arc arg arr ars aru as- asa asb asc asg asr ass asu au- aua aub auc aug aur aus b-u baa bab bac bag bar bas bau bba bbb bbc bbg bbr bbs bbu bca bcb bcc bcg bcr bcs bcu bga bgb bgc bgg bgr bgs bgu bra brb brg brr brs bru bsa bsb bsc bsg bsr bss bsu bua bub buc bug bur bus buu c-- caa cab cac cag car cas cau cba cbb cbc cbg cbr cbs cbu cca ccb ccc ccg ccr ccs ccu cga cgb cgc cgg cgr cgs cgu cra crb crc crg crr crs cru csa csb csc csg csr css csu cua cub cuc cug cur cus cuu gaa gab gac gag gar gas gau gba gbc gbg gbr gbs gbu gca gcb gcc gcg gcr gcs gcu gga ggb ggc ggg ggr ggs ggu gra grb grc grg grr grs gru gsa gsb gsc gsg gsr gss gsu gu- gua gub guc gug gur gus guu ra- raa rab rac rag rar ras rau rba rbb rbc rbg rbr rbs rbu rca rcb rcc rcg rcr rcs rcu rga rgb rgc rgg rgr rgs rra rrb rrc rrg rrr rrs rru rsa rsb rsc rsg rsr rss rsu rua rub ruc rug rur rus ruu saa sab sac sag sar sas sau sba sbb sbc sbg sbr sbs sbu sca scb scc scg scr scs scu sga sgb sgc sgg sgr sgs sgu sr- sra srb src srg srr srs ss- ssa ssb ssc ssg ssr sss ssu sua sub suc sug sur sus suu ua- uaa uab uac uag uar uas uau uba ubb ubc ubg ubr ubs ubu uca ucb ucc ucg ucr ucs ucu uga ugb ugc ugg ugr ugs ugu ur- ura urb urc urg urr urs uru usa usb usc usg usr uss usu uua uuc uug uur uus uuu

aaaa aaab aaac aaar aaas aaba aabb aabc aaca aacb aacc aacr aacs aacu aara aarc aars aaru aasa aasc aass aasu aaus abaa abab abac abag abar abas abau abb- abba abbb abbr abbs abca abcb abcc abcr abcs abra abrc abrs abs- absa abss absu abua abug abus acaa acab acac acag acar acas acba acca accc accs accu acga acgr acgs acr- acra acrc acrr acrs acsa acsc acss acu- acur acus agac agag agar agas agau agba agca agcc agga aggu agra agsa agsg agsu agua agur agus arab arac arag arar aras arau arba arbs arc- arca arcs arga argb args arr- arra arrc arrg arrr arrs arru ars- arsa arsc arsu arua arub arug asaa asab asac asag asar asas asau asba asbu asc- asca ascb ascc ascr asra asrc asrg asrs asru assa assc assr asss assu asub asur asus auaa auca auga augs aur- aura ausa ausu auug baaa baar baas baba babb babr babs babu bac- baca bacc bacs baga bagg bags bar- bara barb barc barg barr bars baru basa basc bass basu bau- baug baur bbas bbau bbbb bbbs bbga bbrc bbrg bcaa bcar bcas bcbc bcbg bcbs bcca bccc bccs bcgs bcra bcrs bcru bcsa bcsc bcss bcuc bgca bggs brab brac brag bras brau brca brcb brrr brrs brsb brsr bruc brug brus bsaa bsac bsas bscs bsgs bsra bssc buar buba bubb bubs bubu buca bucc bucs bucu buga bugg bugs bur- bura burb burg burr burs buru busa busc buss busu buus caaa caab caac caas caba cabg cabs cabu cac- caca cacc cacr caga cagg cagr cags cara carb carc carr cars casa casb casc casr cass casu cauc caus cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbcu cbga cbgb cbsa cbsc cbus ccaa ccab ccac ccag ccar ccas ccba ccbc ccca cccb cccc cccs cccu ccga ccgc ccgs ccra ccrc ccrg ccrs ccsa ccsg ccss ccuc ccus cgac cgas cgcc cgcg cggs cgsb cgss crab crac crag crar cras crau crbc crbu crca crcc crcr crgs crsa crss crub crug crus csaa csab csac csar csas cscb cscc cscr cscs csra csrc csrs cssa cssr csua csur csus cuau cub- cuba cubb cubs cuca cucc cuga cura curb curr curs cusa cusb cusg cuss cusu gaar gaas gaba gabb gabr gabs gabu gaga gagg gags gagu gara garb garg garr gars gasa gasb gasc gasr gass gaua gaub gaur gaus gbag gbas gbbs gc-c gcaa gcbc gccc gccs gcrg gcss gcsu gggg ggss grab grac gras grau grbr grcc grrr grrs grss grua grub grug grur grus gsab gsur guaa guac guag guar guba gubb gubs gubu guca guga gugb gugg gugu gura gurb gurg gurr gurs guru gusa gusb guss guus raab raag raas raba rabb rabs rabu rac- raca racc racs racu raga ragg rags ragu rara rarb rars rasa rasc rass rasu raua raub rauc raus rbbb rbbr rbbs rbss rcac rcas rcbc rccb rccc rccs rcga rcgc rcrg rcsa rcsc rcss rgba rras rrrr rsaa rscc rscs rsgb rsgc rssa rsua ruag ruas ruba rubb rubs rubu ruca ruga rugg rugs rura rurc rurs ruru rusa russ rusu sa-c saab saac saag saar saas saba sabb sabc sabr sabs sabu saca sacc sacr sacs sacu saga sagg sags sagu sara sarc sarg sarr sars saru sasa sasc sass saua sauc saur saus sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbsa sbus scaa scab scac scag scar scas scba sccc sccs scgs scr- scra scrc scrs scsa scsc scsr scsu scua scub scug scur sgaa sgac sgau sgca sgcb sgcg sggg sggs sgss sras srbc srcc srgb srub ssaa ssab ssac ssas ssau ssbr ssca sscc sscs ssgs ssra ssrc ssrg ssrs sssa sssb sssc ssss suar suas sub- suba subb subg subs suc- succ sucr sucs sug- suga sugg sur- sura surc surg