a-ha aaaa aaab aaac aaah aaas aaba aabb aabc aabh aaca aacb aacc aach aaco aacs aaha aahs aaoo aasa aasc aass abaa abab abac abas abb- abba abbb abbo abbs abca abcb abcc abch abcs abha abho abhs aboa abob aboh aboo abos abs- absa abss acaa acab acac acas acba acca accc acch acco accs acha achh acho achs acoa acoh acos acsa acsc acss ahab ahac ahah ahas ahha ahhs ahoa ahsa ahso ahss aoah aoba aoca aocs aoss asaa asab asac asah asao asas asba asbo asc- asca ascb ascc asch asco asha ashs asob asoc asos assa assc assh asso asss baaa baah baas baba babb babo babs bac- baca bacc bach baco bacs baha baho bahs baoh baos basa basc bash baso bass bbas bbbb bbbs bbch bbhs bcaa bcas bcbc bcbs bcca bccc bccs bchs bcos bcsa bcsc bcss bhao bhca bhcc bhhs boab boac boas boba bobb bobo bobs boca boch boco bocs boha boho bohs boob booc booh boos bosa bosc bosh boso boss bsaa bsac bsas bscs bshs bsos bssc c-bo caaa caab caac caah caas caba cabo cabs cac- caca cacc cach caco caha cahs caos casa casb casc cash caso cass cbac cbbc cbbs cbca cbcc cbcs cbha cbhs cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs ccha cchs ccob ccoc ccsa ccss chaa chab chac chah chao chas chca chch chcs chha chhs choc choh choo chos chsc chsh coas coba cobb cobh cobo cobs coca coch coco coha coho cohs coob cooh coos cosa cosc cosh coso coss csaa csab csac csao csas cscb cscc csch csco cscs cshs csob csos cssa haab haas haba habo habs haco hacs haha haho hahs hasa hasc hash hass hbbs hbhs hboc hbos hbss hcbc hcbs hcca hccb hccc hcch hccs hchs hcsa hcsc hcso hcss hhaa hhhh hhhs hoac hoas hoba hobo hobs hoca hoch hocs hoha hoho hoos hosa hosh hoss hsac hsas hsbc hscc hshs hsob oahs oasc oass obas obba obbo obhs obos obss ocab ocac ocas ocbc occa occc ocha ochs ocos ocsa ohba ohcc ohho ohhs ohob ohoh ohos ohso ohss ooaa ooba ooha ooho oohs oooh oooo ooos oosa osas osba osca oscc osco osha oshc osho oshs osoo osos ossa ossb osso s-os sa-c saab saac saah saas saba sabb sabc sabo sabs saca sacc saco sacs saha saho sahs saos sasa sasc sash saso sass sbaa sbac sbas sbbs sbca sbcc sbcs sbhc sbhs sbsa scaa scab scac scas scba sccc sccs sch- scha schh scho schs scob scoh scoo scsa scsc scsh scso shab shac shah shao shas shbs shca shcc shha shhh shhs shoa shoo shos shsc soas soba sobo sobs soca soch soco socs soha sohh soho sohs soos sosa sosh soso soss ssaa ssab ssac ssao ssas ssca sscc sscs sshs ssoc sssa sssb sssc sssh ssss