a-a a-b a-c aaa aab aac aan aar aas aau ab- aba abb abc abn abr abs abu ac- aca acb acc acn acr acs acu an- ana anb anc ann anr ans anu ar- ara arb arc arn arr ars aru as- asa asb asc asn asr ass asu au- aua aub auc aun aur aus b-u baa bab bac ban bar bas bau bba bbb bbc bbn bbr bbs bbu bca bcb bcc bcn bcr bcs bcu bna bnb bnc bnn bnr bns bnu bra brb brn brr brs bru bsa bsb bsc bsn bsr bss bsu bua bub buc bun bur bus buu c-- caa cab cac can car cas cau cba cbb cbc cbn cbr cbs cbu cca ccb ccc ccn ccr ccs ccu cn- cna cnb cnc cnn cnr cns cnu cra crb crc crn crr crs cru csa csb csc csn csr css csu cua cub cuc cun cur cus cuu naa nab nac nan nar nas nau nba nbb nbc nbn nbr nbs nbu nca ncb ncc ncn ncr ncs ncu nna nnb nnc nnn nns nnu nra nrb nrc nrn nrr nrs nru nsa nsb nsc nsn nsr nss nsu nua nub nuc nun nur nus nuu ra- raa rab rac ran rar ras rau rba rbb rbc rbn rbr rbs rbu rca rcb rcc rcn rcr rcs rcu rna rnb rnc rnn rnr rns rnu rra rrb rrc rrn rrr rrs rru rsa rsb rsc rsn rsr rss rsu rua rub ruc run rur rus ruu saa sab sac san sar sas sau sba sbb sbc sbn sbr sbs sbu sca scb scc scn scr scs scu sna snb snc snn snr sns snu sr- sra srb src srn srr srs ss- ssa ssb ssc ssn ssr sss ssu sua sub suc sun sur sus suu ua- uaa uab uac uan uar uas uau uba ubb ubc ubn ubr ubs ubu uca ucb ucc ucn ucr ucs ucu un- una unb unc unn unr uns unu ur- ura urb urc urn urr urs uru usa usb usc usn usr uss usu uua uuc uun uur uus uuu

-ana a-un aaaa aaab aaac aaan aaar aaas aaba aabb aabc aaca aacb aacc aacn aacr aacs aacu aana aara aarc aars aaru aasa aasc aass aasu aaus abaa abab abac aban abar abas abau abb- abba abbb abbr abbs abca abcb abcc abcn abcr abcs abnu abra abrc abrs abs- absa abss absu abua abun abus acaa acab acac acan acar acas acba acca accc accs accu acr- acra acrc acrr acrs acsa acsc acss acu- acur acus ana- anaa anab anac anan anar anas anau anba anbb anbu anca ancc anna annb anns anrc ansa ansu anua anub anun anus arab arac aran arar aras arau arba arbs arc- arca arcs arna arns arr- arra arrc arrr arrs arru ars- arsa arsc arsu arua arub arun asaa asab asac asan asar asas asau asba asbu asc- asca ascb ascc ascr asnc asra asrc asrs asru assa assc assn assr asss assu asub asun asur asus auaa auca auna aur- aura ausa ausu baaa baan baar baas baba babb babr babs babu bac- baca bacc bacn bacs bana banc bann banr bans banu bar- bara barb barc barn barr bars baru basa basc bass basu bau- baur bbas bbau bbbb bbbs bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcnu bcra bcrs bcru bcsa bcsc bcsn bcss bcuc bnas bnrr bnss brab brac bran bras brau brca brcb brna brns brrr brrs brsb brsr bruc brun brus bsaa bsac bsas bscs bsns bsra bssc buar buba bubb bubs bubu buca bucc bucs bucu buna bunb bunn buns bunu bur- bura burb burn burr burs buru busa busc buss busu buus caaa caab caac caan caas caba cabs cabu cac- caca cacc cacr cana canc cann cans cara carb carc carn carr cars casa casb casc casr cass casu cauc caus cbac cbar cbbc cbbs cbca cbcc cbcn cbcr cbcs cbcu cbna cbrn cbsa cbsc cbsn cbus ccaa ccab ccac ccar ccas ccba ccbc ccbn ccca cccb cccc cccs cccu ccna ccnb ccnc ccnr ccns ccnu ccra ccrc ccrs ccsa ccsn ccss ccuc ccus cnaa cnac cnas cnbc cnna cnrc cnrr cnsa cnss crab crac cran crar cras crau crbc crbu crca crcc crcr crna crns crsa crss crub crun crus csaa csab csac csar csas cscb cscc cscr cscs csra csrc csrs cssa cssr csua csur csus cuan cuau cub- cuba cubb cubs cuca cucc cucn cuna cura curb curn curr curs cusa cusb cuss cusu naaa naab naac naan naar naas naba nabc nabs nabu naca nacc nacs nan- nana nanb nann nans nanu nara narc narn narr nars naru nas- nasa nasb nasc nasr nass nasu naur naus nbaa nbar nbas nbbc nbca nbcc nbcs ncaa ncac ncar ncba ncbc ncbs ncca nccc nccn nccr nccs nccu ncna ncnc ncra ncrc ncsa ncsc ncss ncua 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 nsub nuan nuba nubc nubs nuca nucs nucu nuna nunc nunn nuns nura nurc nurn nurr nurs nuru nuss nusu raab raan raas raba rabb rabs rabu rac- raca racc racs racu rana ranc rann rans rara rarb rars rasa rasc rass rasu raua raub rauc raun raus rbbb rbbr rbbs rbss rcac rcas rcbc rccb rccc rccs rcnr rcsa rcsc rcss rnas rnbr rncs rras rrna rrrr rrun rsaa rscc rscn rscs rsna rsnn rsnr rssa rsua ruan ruas ruba rubb rubs rubu ruca runa runc runn runs rura rurc rurs ruru rusa russ rusu ruun sa-c saab saac saan saar saas saba sabb sabc sabr sabs sabu saca sacc sacn sacr sacs sacu sana sann sanr sans sanu sara sarc sarn sarr sars saru sasa sasc sass saua sauc saun saur saus sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbsa sbus scaa scab scac scan scar