a-fu aaaa aaab aaac aaaf aaal aaas aaba aabb aabc aabl aaca aacb aacc aacf aacl aacs aacu aafa aafb aafc aaff aafl aala aalc aall aals aalu aasa aasc aasf aass aasu aaus abaa abab abac abaf abal abas abau abb- abba abbb abbs abca abcb abcc abcf abcl abcs abff abla abls abs- absa absf absl abss absu abua abuf abul abus acaa acab acac acas acba acbl acca accc accf accs accu acfc acfl acfs acla aclc acls aclu acsa acsc acsl acss acu- acuf acul acus afaa afbs afca afcb afcc afcs afcu affa affc affs afla aflc afsa afsb afsc afua afus alaa alac alal alas alau alb- alba albc albs albu alca alcc alcs alfa alfs all- alla alll alls allu alsa alsc alua aluf alus asaa asab asac asaf asal asas asau asba asbu asc- asca ascb ascc ascl asfa asla assa assc assl asss assu asub asus auaa auca aufc aufs aul- aula aulf aull auls aulu ausa ausu baaa baaf baal baas baba babb babs babu bac- baca bacc bacs bafc baff bala balc balf ball bals balu basa basc basf bass basu bau- bauf baul bbas bbau bbbb bbbs bbfc bblb bbls bcaa bcas bcbc bcbs bcca bccc bccl bccs bcfc bcsa bcsc bcsl bcss bcuc bfas bfca bfcs bffl bffs blaa blab blac blas blau blcu blfc blls blss blub bluf blus bsaa bsac bsas bscs bsfa bsfc bsff bsfs bslc bssc bual buba bubb bubs bubu buca bucc bucs bucu bufc buff bula bulb bull buls bulu busa busc buss busu buus caaa caab caac caaf caal caas caba cabf cabs cabu cac- caca cacc cafa cafb cafc caff cafl cafs cafu cala calc calf call cals calu casa casb casc casl cass casu cauc cauf caul caus cbac cbal cbbc cbbs cbca cbcc cbcl cbcs cbcu cbfb cbfc cblb cblc cbsa cbsc cbus ccaa ccab ccac ccaf ccas ccba ccbc ccca cccb cccc cccf cccl cccs cccu ccfa ccfc ccff ccfl ccla cclc ccls ccsa ccsf ccsl ccss ccuc ccus cfaa cfab cfac cfbc cfbs cfca cfcb cfcf cfcl cfcs cffb cfls cfsa cfsl clab claf clas clau clsa clsc club csaa csab csac csas csbf cscb cscc cscf cscl cscs csfc csla cslu cssa csua csuf csus cuau cub- cuba cubb cubs cuca cucc cufa cufc cuff cula culb culc cull culs cusa cusb cuss cusu faaa faac faas faba fabs fabu faca facc facs fafa fafc faff fala falc fall fals falu fasa fasc fass faul fbla fbus fcab fcal fcas fcba fcbs fcca fccf fcsc fcsl ffcc ffff ffsa ffss flab flac flcl flub fluf flus fsas fscb fscc fssa fssc fssf fubb fubs fubu fuc- fuca fufc fuff fufu fula full fuls fulu fusa fusc fuss fusu laaa laac laal laas laba labs labu laca lacc lacl lacs lacu lafb lafc laff lala lall lalu lasa lass lasu laub lauf laul laus lbcc lbsc lcac lcbc lcca lccc lccs lcfc lcls lcsc lfca lfcc llbs llcc llcs lllc llll lsbu lscb lscs lsfc lsla lssa luas luau luba lubs luca lucs luff lufu lula lull lulu lusa luss luua sa-c saab saac saaf saal saas saba sabb sabc sabs sabu saca sacc sacs sacu safa safb safc saff safu sala salc salf sall sals salu sasa sasc sasf sasl sass saua sauc sauf saul saus sbaa sbac sbas sbbs sbca sbcc sbcs sbfc sbsa sbus scaa scab scac scaf scal scas scba sccc sccl sccs scfa scfc scl- sclc scls scsa scsc scsl scsu scua scub scul sfas sfba sfbc sfca sfcc sfcs sffc sfla sflc sfls sfss sfsu slaa slab slac slaf slas slau slcc slcu slsa slsc slsu slub sluc ssaa ssab ssac ssas ssau ssca sscc sscs ssfc ssfl ssla sslc sssa sssb sssc sssf ssss suas sub- suba subb subl subs suc- succ sucs suf- sufa sufc suff sufs sufu sul- sula sulc sulf sull sulu sus- susa suss susu suus uabc uaca uafa uasa uaua ubac ubal ubba ubla ubls ucal ucas ucbc ucca ucfa ucfb ucla ucsa ucsb ucsc ucsf ucsu ucua ufcu uffa ulaa ulas ulbc ulcc ulla ulsa ulua ulul ulus us-a usaa usac usaf usal usas usba usbc usbl usbs usca uscc uscf uscs usfa usfc usfl usfs uslu ussa ussb ussc ussf usss ussu usua usul usus uulu uuuu