a-ha aaaa aaab aaac aaah aaas aaba aabb aabc aabh aaca aacb aacc aach aacs aaha aahs aasa aasc aass abaa abab abac abas abb- abba abbb abbs abca abcb abcc abch abcs abha abhs abs- absa abss acaa acab acac acas acba acca accc acch accs acha achh achs acsa acsc acss ahab ahac ahah ahas ahha ahhs ahsa ahss asaa asab asac asah asas asba asc- asca ascb ascc asch asha ashs assa assc assh asss baaa baah baas baba babb babs bac- baca bacc bach bacs baha bahs basa basc bash bass bbas bbbb bbbs bbch bbhs bcaa bcas bcbc bcbs bcca bccc bccs bchs bcsa bcsc bcss bhca bhcc bhhs bsaa bsac bsas bscs bshs bssc caaa caab caac caah caas caba cabs cac- caca cacc cach caha cahs casa casb casc cash cass cbac cbbc cbbs cbca cbcc cbcs cbha cbhs cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs ccha cchs ccsa ccss chaa chab chac chah chas chca chch chcs chha chhs chsc chsh csaa csab csac csas cscb cscc csch cscs cshs cssa haab haas haba habs hacs haha hahs hasa hasc hash hass hbbs hbhs hbss hcbc hcbs hcca hccb hccc hcch hccs hchs hcsa hcsc hcss hhaa hhhh hhhs hsac hsas hsbc hscc hshs sa-c saab saac saah saas saba sabb sabc sabs saca sacc sacs saha sahs sasa sasc sash sass sbaa sbac sbas sbbs sbca sbcc sbcs sbhc sbhs sbsa scaa scab scac scas scba sccc sccs sch- scha schh schs scsa scsc scsh shab shac shah shas shbs shca shcc shha shhh shhs shsc ssaa ssab ssac ssas ssca sscc sscs sshs sssa sssb sssc sssh ssss