-ana aaaa aaab aaac aaan aaar aaas aaba aabb aabc aaca aacb aacc aacn aacr aacs aana aara aarc aars aasa aasc aass abaa abab abac aban abar abas abb- abba abbb abbr abbs abca abcb abcc abcn abcr abcs abra abrc abrs abs- absa abss acaa acab acac acan acar acas acba acca accc accs acr- acra acrc acrr acrs acsa acsc acss ana- anaa anab anac anan anar anas anba anbb anca ancc anna annb anns anrc ansa arab arac aran arar aras arba arbs arc- arca arcs arna arns arr- arra arrc arrr arrs ars- arsa arsc asaa asab asac asan asar asas asba asc- asca ascb ascc ascr asnc asra asrc asrs assa assc assn assr asss baaa baan baar baas baba babb babr babs bac- baca bacc bacn bacs bana banc bann banr bans bar- bara barb barc barn barr bars basa basc bass bbas bbbb bbbs bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcra bcrs bcsa bcsc bcsn bcss bnas bnrr bnss brab brac bran bras brca brcb brna brns brrr brrs brsb brsr bsaa bsac bsas bscs bsns bsra bssc caaa caab caac caan caas caba cabs cac- caca cacc cacr cana canc cann cans cara carb carc carn carr cars casa casb casc casr cass cbac cbar cbbc cbbs cbca cbcc cbcn cbcr cbcs cbna cbrn cbsa cbsc cbsn ccaa ccab ccac ccar ccas ccba ccbc ccbn ccca cccb cccc cccs ccna ccnb ccnc ccnr ccns ccra ccrc ccrs ccsa ccsn ccss cnaa cnac cnas cnbc cnna cnrc cnrr cnsa cnss crab crac cran crar cras crbc crca crcc crcr crna crns crsa crss csaa csab csac csar csas cscb cscc cscr cscs csra csrc csrs cssa cssr naaa naab naac naan naar naas naba nabc nabs naca nacc nacs nan- nana nanb nann nans nara narc narn narr nars nas- nasa nasb nasc nasr nass nbaa nbar nbas nbbc nbca nbcc nbcs ncaa ncac ncar ncba ncbc ncbs ncca nccc nccn nccr nccs ncna ncnc ncra ncrc ncsa ncsc ncss nnnn nnsa nnss nrab nras nrca nrcs nrna nrrc nrsa nrsc nsaa nsac nsar nsca nscc nscs nsna nsnr nsra nsrc nssa nssb nssc nssr nsss raab raan raas raba rabb rabs rac- raca racc racs rana ranc rann rans rara rarb rars rasa rasc rass rbbb rbbr rbbs rbss rcac rcas rcbc rccb rccc rccs rcnr rcsa rcsc rcss rnas rnbr rncs rras rrna rrrr rsaa rscc rscn rscs rsna rsnn rsnr rssa sa-c saab saac saan saar saas saba sabb sabc sabr sabs saca sacc sacn sacr sacs sana sann sanr sans sara sarc sarn sarr sars sasa sasc sass sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scan scar scas scba sccc sccs scna scnr scr- scra scrc scrn scrs scsa scsc scsn scsr snab snar snas snba snca sncc snns snra snrs sras srbc srcc srna srnn ssaa ssab ssac ssan ssas ssbn ssbr ssca sscc sscs ssns ssra ssrc ssrs sssa sssb sssc ssss