a-a a-b a-c aaa aab aac aaf aao aas aau ab- aba abb abc abf abo abs abu ac- aca acb acc acf aco acs acu af- afa afb afc aff afo afs afu aoa aob aoc aof aoo aos aou as- asa asb asc asf aso ass asu au- aua aub auc auf auo aus b-u baa bab bac baf bao bas bau bba bbb bbc bbf bbo bbs bbu bca bcb bcc bcf bco bcs bcu bfa bfb bfc bff bfo bfs bfu boa bob boc bof boo bos bou bsa bsb bsc bsf bso bss bsu bua bub buc buf buo bus buu c-- caa cab cac caf cao cas cau cba cbb cbc cbf cbo cbs cbu cca ccb ccc ccf cco ccs ccu cfa cfb cfc cff cfo cfs cfu co- coa cob coc cof coo cos cou csa csb csc csf cso css csu cua cub cuc cuf cuo cus cuu faa fab fac faf fao fas fau fba fbb fbc fbf fbo fbs fbu fca fcb fcc fcf fco fcs fcu ffa ffc fff ffo ffs ffu foa fob foc fof foo fos fou fsa fsb fsc fsf fso fss fsu fua fub fuf fuo fus fuu oaa oab oac oaf oao oas oau ob- oba obb obc obf obo obs obu oc- oca ocb occ ocf oco ocs ocu of- ofa ofb ofc off ofo ofs ofu oo- ooa oob ooc oof ooo oos os- osa osb osc osf oso oss osu ou- oua ouc ouf ouo ous saa sab sac saf sao sas sau sba sbb sbc sbf sbo sbs sbu sca scb scc scf sco scs scu sfa sfb sfc sff sfo sfs sfu soa sob soc sof soo sos sou ss- ssa ssb ssc ssf sso sss ssu sua sub suc suf suo sus suu ua- uaa uab uac uaf uao uas uau uba ubb ubc ubf ubo ubs ubu uca ucb ucc ucf uco ucs ucu ufa ufc uff ufo ufs ufu uoa uob uoc uoo uos usa usb usc usf uso uss usu uua uuc uus uuu

-ous a-fu aaaa aaab aaac aaaf aaas aaba aabb aabc aaca aacb aacc aacf aaco aacs aacu aafa aafb aafc aaff aaoo aasa aasc aasf aass aasu aaus abaa abab abac abaf abas abau abb- abba abbb abbo abbs abca abcb abcc abcf abcs abff aboa abob abof aboo abos abou abs- absa absf abss absu abua abuf abus acaa acab acac acas acba acca accc accf acco accs accu acfc acfs acoa acos acou acsa acsc acss acu- acuf acuo acus afaa afao afbs afca afcb afcc afcs afcu affa affc affo affs afoa afoo afsa afsb afsc afua afus aoba aoca aocs aoss aouf aous asaa asab asac asaf asao asas asau asba asbo asbu asc- asca ascb ascc asco asfa asob asoc asof asos asou assa assc asso asss assu asub asus auaa auca aufc aufs ausa ausu baaa baaf baas baba babb babo babs babu bac- baca bacc baco bacs bafc baff bafo baos basa basc basf baso bass basu bau- bauf bbas bbau bbbb bbbs bbfc bcaa bcas bcbc bcbs bcca bccc bccs bcfc bcof bcos bcsa bcsc bcss bcuc bfas bfca bfcs bffs boab boac boas boba bobb bobo bobs bobu boca boco bocs bocu bofa boff bofs bofu boob booc boof boos bosa bosc boso boss bosu boua bouf bous bsaa bsac bsas bscs bsfa bsfc bsff bsfs bsos bssc buba bubb bubo bubs bubu buca bucc buco bucs bucu bufc buff bufo busa busc buss busu buus c-bo caaa caab caac caaf caas caba cabf cabo cabs cabu cac- caca cacc caco cafa cafb cafc caff cafs cafu caos casa casb casc caso cass casu cauc cauf cauo caus cbac cbbc cbbs cbca cbcc cbcs cbcu cbfb cbfc cbsa cbsc cbus ccaa ccab ccac ccaf ccas ccba ccbc ccca cccb cccc cccf cccs cccu ccfa ccfc ccff ccob ccoc ccsa ccsf ccss ccuc ccus cfaa cfab cfac cfao cfbc cfbs cfca cfcb cfcf cfco cfcs cffb cfoa cfos cfsa coas coba cobb cobo cobs cobu coca coco cocu cofc coff cofs coob coof coos cosa cosc coso coss coua coub cous csaa csab csac csao csas csbf cscb cscc cscf csco cscs csfc csob csos cssa csua csuf csus cuau cub- cuba cubb cubs cuca cucc cufa cufc cuff cufo cusa cusb cuso cuss cusu faaa faac faas faba fabo fabs fabu faca facc facs fafa fafc faff fafo fasa fasc faso fass fbus fcab fcas fcba fcbs fcca fccf fcsc ffcc ffff ffsa ffss foaf foba fobs foca foco focs fofo foof foos fosa fosb foso foss foua fous fsas fscb fscc fsfo fssa fssc fssf fubb fubs fubu fuc- fuca fufc fuff fufu fusa fusc fuso fuss fusu oaau oafc oafo oafs oasc oass obas obba obbo obos obss obus ocab ocac ocas ocbc occa occc ocfa ocos ocsa ofas off- offa offc offo offs offu ofus ooaa ooba ooff oofs oooo ooos oosa oous osaf osas osba osca oscc osco osfa osoo osos ossa ossb osso ossu ouac oubs oucc oufc ouff ousa ouu- s-os sa-c saab saac saaf saas saba sabb sabc sabo sabs sabu saca sacc saco sacs sacu safa safb safc saff safo safu saos saou sasa sasc sasf saso sass saua sauc sauf saus sbaa sbac sbas sbbs sbca sbcc sbcs sbfc sbsa sbus scaa scab scac scaf scas scba sccc sccs scfa scfc scob scoo scsa scsc scso scsu scua scub sfas sfba sfbc sfca sfcc sfco sfcs sffc sfos sfss sfsu soas soba sobo sobs sobu soca soco socs sofa sofo soof soos sosa soso soss souf sous ssaa ssab ssac ssao ssas ssau ssca sscc sscs ssfc ssoc sssa sssb sssc sssf ssss suas sub- suba subb subo subs suc- succ sucs suf- sufa sufc suff sufs sufu suos sus- susa suso suss susu suus uabc uaca uafa uaoc uasa uaua ubac ubba ubbo uboc ubos ucas ucbc ucca ucfa ucfb ucos