a-a a-b a-c aaa aab aac aaf aan aas aau ab- aba abb abc abf abn abs abu ac- aca acb acc acf acn acs acu af- afa afb afc aff afn afs afu an- ana anb anc anf ann ans anu as- asa asb asc asf asn ass asu au- aua aub auc auf aun aus b-u baa bab bac baf ban bas bau bba bbb bbc bbf bbn bbs bbu bca bcb bcc bcf bcn bcs bcu bfa bfb bfc bff bfn bfs bfu bna bnb bnc bnf bnn bns bnu bsa bsb bsc bsf bsn bss bsu bua bub buc buf bun bus buu c-- caa cab cac caf can cas cau cba cbb cbc cbf cbn cbs cbu cca ccb ccc ccf ccn ccs ccu cfa cfb cfc cff cfn cfs cfu cn- cna cnb cnc cnf cnn cns cnu csa csb csc csf csn css csu cua cub cuc cuf cun cus cuu faa fab fac faf fan fas fau fba fbb fbc fbf fbn fbs fbu fca fcb fcc fcf fcn fcs fcu ffa ffc fff ffn ffs ffu fna fnb fnc fnf fnn fns fnu fsa fsb fsc fsf fsn fss fsu fua fub fuf fun fus fuu naa nab nac naf nan nas nau nba nbb nbc nbf nbn nbs nbu nca ncb ncc ncf ncn ncs ncu nfa nfb nfc nff nfn nfs nfu nna nnb nnc nnf nnn nns nnu nsa nsb nsc nsf nsn nss nsu nua nub nuc nun nus nuu saa sab sac saf san sas sau sba sbb sbc sbf sbn sbs sbu sca scb scc scf scn scs scu sfa sfb sfc sff sfn sfs sfu sna snb snc snf snn sns snu ss- ssa ssb ssc ssf ssn sss ssu sua sub suc suf sun sus suu ua- uaa uab uac uaf uan uas uau uba ubb ubc ubf ubn ubs ubu uca ucb ucc ucf ucn ucs ucu ufa ufc uff ufn ufs ufu un- una unb unc unf unn uns unu usa usb usc usf usn uss usu uua uuc uun uus uuu

-ana a-fu a-un aaaa aaab aaac aaaf aaan aaas aaba aabb aabc aaca aacb aacc aacf aacn aacs aacu aafa aafb aafc aaff aana aasa aasc aasf aass aasu aaus abaa abab abac abaf aban abas abau abb- abba abbb abbs abca abcb abcc abcf abcn abcs abff abnu abs- absa absf abss absu abua abuf abun abus acaa acab acac acan acas acba acca accc accf accs accu acfc acfs acsa acsc acss acu- acuf acus afaa afan afbs afca afcb afcc afcs afcu affa affc affs afsa afsb afsc afua afus ana- anaa anab anac anan anas anau anba anbb anbu anca ancc anfa anna annb anns ansa ansf ansu anua anub anuf anun anus asaa asab asac asaf asan asas asau asba asbu asc- asca ascb ascc asfa asnc assa assc assn asss assu asub asun asus auaa auca aufc aufs auna ausa ausu baaa baaf baan baas baba babb babs babu bac- baca bacc bacn bacs bafc baff bana banc bann bans banu basa basc basf bass basu bau- bauf bbas bbau bbbb bbbs bbfc bbfn bcaa bcas bcbc bcbs bcca bccc bccs bcfc bcnu bcsa bcsc bcsn bcss bcuc bfas bfca bfcs bffs bnas bnss bsaa bsac bsas bscs bsfa bsfc bsff bsfs bsns bssc buba bubb bubs bubu buca bucc bucs bucu bufc buff buna bunb bunn buns bunu busa busc buss busu buus caaa caab caac caaf caan caas caba cabf cabs cabu cac- caca cacc cafa cafb cafc caff cafs cafu cana canc cann cans casa casb casc cass casu cauc cauf caus cbac cbbc cbbs cbca cbcc cbcn cbcs cbcu cbfb cbfc cbna cbsa cbsc cbsn cbus ccaa ccab ccac ccaf ccas ccba ccbc ccbn ccca cccb cccc cccf cccs cccu ccfa ccfc ccff ccna ccnb ccnc ccnf ccns ccnu ccsa ccsf ccsn ccss ccuc ccus cfaa cfab cfac cfbc cfbn cfbs cfca cfcb cfcf cfcn cfcs cffb cfnb cfns cfsa cfun cnaa cnac cnas cnbc cnfa cnna cnsa cnss csaa csab csac csas csbf cscb cscc cscf cscs csfc cssa csua csuf csus cuan cuau cub- cuba cubb cubs cuca cucc cucn cufa cufc cuff cuna cusa cusb cuss cusu faaa faac faan faas faba fabs fabu faca facc facs fafa fafc faff fana fanc fans fanu fasa fasc fasn fass faun fbus fcab fcas fcba fcbs fcca fccf fcsc ffcc ffff ffsa ffss ffun fnac fnuf fsas fscb fscc fssa fssc fssf fubb fubs fubu fuc- fuca fufc fuff fufu funa funf funs fusa fusc fuss fusu naaa naab naac naan naas naba nabc nabf nabs nabu naca nacc nacf nacs nafa nafc naff nafs nan- nana nanb nann nans nanu nas- nasa nasb nasc nasf nass nasu naus nbaa nbaf nbas nbbc nbca nbcc nbcs nbfa nbfc nbuf ncaa ncac ncba ncbc ncbs ncca nccc nccf nccn nccs nccu ncfc ncna ncnc ncsa ncsc ncsf ncss ncua nfaa nfas nfcu nfff nfsu nnnn nnsa nnss nsaa nsac nsca nscc nscs nsfc nsfs nsna nssa nssb nssc nssf nsss nsub nuan nuba nubc nubs nuca nucs nucu nuff nuna nunc nunn nuns nuss nusu sa-c saab saac saaf saan saas saba sabb sabc sabs sabu saca sacc sacn sacs sacu safa safb safc saff safu sana sann sans sanu sasa sasc sasf sass saua sauc sauf saun saus sbaa sbac sbas sbbs sbca sbcc sbcs sbfc sbsa sbus scaa scab scac scaf scan scas scba sccc sccs scfa scfc scna scsa scsc scsn scsu scua scub scun sfas sfba sfbc sfca sfcc sfcs sffc sfnb sfss sfsu snab snas snba snca sncc sncf snfu snns snub snus ssaa ssab ssac ssan ssas ssau ssbn ssca sscc sscs ssfc ssns sssa sssb sssc sssf ssss suan suas sub- suba subb subs suc- succ sucs suf- sufa sufc suff sufs sufu sun- suna sunb sunn suns sunu sus- susa suss susu suus uabc uaca uafa uasa uaua ubac ubba ucan