-ana aaaa aaab aaac aaaf aaan aaas aaba aabb aabc aaca aacb aacc aacf aacn aaco aacs aafa aafb aafc aaff aana aaon aaoo aasa aasc aasf aass abaa abab abac abaf aban abas abb- abba abbb abbo abbs abca abcb abcc abcf abcn abcs abff aboa abob abof abon aboo abos abs- absa absf abss acaa acab acac acan acas acba acca accc accf acco accs acfc acfs acoa acon acos acsa acsc acss afaa afan afao afbs afca afcb afcc afcs affa affc affo affs afoa afoo afsa afsb afsc ana- anaa anab anac anan anao anas anba anbb anbo anca ancc anco anfa anfo anna annb anno anns ano- anoa anon anos ansa ansf anso aoba aoca aocs aonb aono aoss asaa asab asac asaf asan asao asas asba asbo asc- asca ascb ascc asco asfa asnc asno asob asoc asof ason asos assa assc assn asso asss baaa baaf baan baas baba babb babo babs bac- baca bacc bacn baco bacs bafc baff bafo bana banc bann bano bans baon baos basa basc basf baso bass bbas bbbb bbbs bbfc bbfn bcaa bcas bcbc bcbs bcca bccc bccs bcfc bcof bcos bcsa bcsc bcsn bcss bfas bfca bfcs bffs bnas bnoc bnss boab boac boan boas boba bobb bobo bobs boca boco bocs bofa boff bofs bona bonc bonn bono bons boob booc boof boon boos bosa bosc bosn boso boss bsaa bsac bsas bscs bsfa bsfc bsff bsfs bsns bson bsos bssc c-bo caaa caab caac caaf caan caas caba cabf cabo cabs cac- caca cacc caco cafa cafb cafc caff cafs cana canc cann cano cans caos casa casb casc caso cass cbac cbbc cbbs cbca cbcc cbcn cbcs cbfb cbfc cbna cbsa cbsc cbsn ccaa ccab ccac ccaf ccas ccba ccbc ccbn ccca cccb cccc cccf cccs ccfa ccfc ccff ccna ccnb ccnc ccnf ccns ccob ccoc ccsa ccsf ccsn ccss cfaa cfab cfac cfao cfbc cfbn cfbs cfca cfcb cfcf cfcn cfco cfcs cffb cfnb cfns cfoa cfos cfsa cnaa cnac cnas cnbc cnco cnfa cnna cnsa cnss coan coas coba cobb cobo cobs coca coco cofc coff cofs con- cona conc conf conn cono cons coob coof coon coos cosa cosc coso coss csaa csab csac csao csas csbf cscb cscc cscf csco cscs csfc csob csos cssa faaa faac faan faas faba fabo fabs faca facc facs fafa fafc faff fafo fana fanc fano fans faon fasa fasc fasn faso fass fcab fcas fcba fcbs fcca fccf fcsc ffcc ffff ffsa ffss fnac foaf foan foba fobs foca foco focs fofo fono fons foof foon foos fosa fosb foso foss fsas fscb fscc fsfo fssa fssc fssf naaa naab naac naan naas naba nabc nabf nabo nabs naca nacc nacf naco nacs nafa nafc naff nafo nafs nan- nana nanb nann nano nans naoc naos nas- nasa nasb nasc nasf naso nass nbaa nbaf nbas nbbc nbbo nbca nbcc nbco nbcs nbfa nbfc ncaa ncac ncba ncbc ncbs ncca nccc nccf nccn nccs ncfc ncna ncnc ncoa ncoc ncos ncsa ncsc ncsf ncss nfaa nfas nfff nfon nnnn nnos nnsa nnss noaa noac noba nobc nobo nobs noco nocs non- nona nonn nono nons noo- noob noon nooo noos nos- nosa noss nsaa nsac nsbo nsca nscc nscs nsfc nsfs nsna nsof nsos nssa nssb nssc nssf nsso nsss oafc oafo oafs oasc oass oban obas obba obbo obon obos obsn obss ocab ocac ocan ocas ocbc occa occc occn ocfa ocna ocon ocos ocsa ofan ofas off- offa offc offo offs ofna ofno onab onan onas onc- onca oncf onco onna onno onon onos onsc onso ooaa ooba ooff oofs oona oons oooo ooos oosa osaf osan osas osba osca oscc osco osfa osno osoo osos ossa ossb osso s-os sa-c saab saac saaf saan saas saba sabb sabc sabo sabs saca sacc sacn saco sacs safa safb safc saff safo sana sann sano sans saon saos sasa sasc sasf saso sass sbaa sbac sbas sbbs sbca sbcc sbcs sbfc sbsa scaa scab scac scaf scan scas scba sccc sccs scfa scfc scna scob scon scoo scsa scsc scsn scso sfas sfba sfbc sfca sfcc sfco sfcs sffc sfnb sfos sfss snab snas snba snca sncc sncf snco snns snoa snob snoc snoo snos soan soas soba sobo sobs soca soco socs sofa sofo son- sona sono sons soof soon soos sosa soso soss ssaa ssab ssac ssan ssao ssas ssbn ssca sscc sscs ssfc ssns ssoc sssa sssb sssc sssf ssss