-ana aaaa aaab aaac aaan aaas aaba aabb aabc aaca aacb aacc aacn aaco aacs aana aaon aaoo aasa aasc aass abaa abab abac aban abas abb- abba abbb abbo abbs abca abcb abcc abcn abcs aboa abob abon aboo abos abs- absa abss acaa acab acac acan acas acba acca accc acco accs acoa acon acos acsa acsc acss ana- anaa anab anac anan anao anas anba anbb anbo anca ancc anco anna annb anno anns ano- anoa anon anos ansa anso aoba aoca aocs aonb aono aoss asaa asab asac asan asao asas asba asbo asc- asca ascb ascc asco asnc asno asob asoc ason asos assa assc assn asso asss baaa baan baas baba babb babo babs bac- baca bacc bacn baco bacs bana banc bann bano bans baon baos basa basc baso bass bbas bbbb bbbs bcaa bcas bcbc bcbs bcca bccc bccs bcos bcsa bcsc bcsn bcss bnas bnoc bnss boab boac boan boas boba bobb bobo bobs boca boco bocs bona bonc bonn bono bons boob booc boon boos bosa bosc bosn boso boss bsaa bsac bsas bscs bsns bson bsos bssc c-bo caaa caab caac caan caas caba cabo cabs cac- caca cacc caco cana canc cann cano cans caos casa casb casc caso cass cbac cbbc cbbs cbca cbcc cbcn cbcs cbna cbsa cbsc cbsn ccaa ccab ccac ccas ccba ccbc ccbn ccca cccb cccc cccs ccna ccnb ccnc ccns ccob ccoc ccsa ccsn ccss cnaa cnac cnas cnbc cnco cnna cnsa cnss coan coas coba cobb cobo cobs coca coco con- cona conc conn cono cons coob coon coos cosa cosc coso coss csaa csab csac csao csas cscb cscc csco cscs csob csos cssa naaa naab naac naan naas naba nabc nabo nabs naca nacc naco nacs nan- nana nanb nann nano nans naoc naos nas- nasa nasb nasc naso nass nbaa nbas nbbc nbbo nbca nbcc nbco nbcs ncaa ncac ncba ncbc ncbs ncca nccc nccn nccs ncna ncnc ncoa ncoc ncos ncsa ncsc ncss 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 nsna nsos nssa nssb nssc nsso nsss oasc oass oban obas obba obbo obon obos obsn obss ocab ocac ocan ocas ocbc occa occc occn ocna ocon ocos ocsa onab onan onas onc- onca onco onna onno onon onos onsc onso ooaa ooba oona oons oooo ooos oosa osan osas osba osca oscc osco osno osoo osos ossa ossb osso s-os sa-c saab saac saan saas saba sabb sabc sabo sabs saca sacc sacn saco sacs sana sann sano sans saon saos sasa sasc saso sass sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scan scas scba sccc sccs scna scob scon scoo scsa scsc scsn scso snab snas snba snca sncc snco snns snoa snob snoc snoo snos soan soas soba sobo sobs soca soco socs son- sona sono sons soon soos sosa soso soss ssaa ssab ssac ssan ssao ssas ssbn ssca sscc sscs ssns ssoc sssa sssb sssc ssss