a-ya aaaa aaab aaac aaas aaba aabb aabc aaby aaca aacb aacc aacs aacy aasa aasc aass abaa abab abac abas abay abb- abba abbb abbs abby abca abcb abcc abcs abs- absa abss abyc abys abyy acaa acab acac acas acba acca accc accs accy acsa acsc acss asaa asab asac asas asay asba asby asc- asca ascb ascc assa assc asss assy asya ayas ayay ayca ayya baaa baas baba babb babs baby bac- baca bacc bacs basa basc bass baya bays bbas bbay bbbb bbbs bcaa bcas bcbc bcbs bcca bccc bccs bcsa bcsc bcss bsaa bsac bsas bscs bssc byas bysb byss bysy caaa caab caac caas caba cabs caby cac- caca cacc casa casb casc cass cays cbac cbbc cbbs cbca cbcc cbcs cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs ccsa ccss csaa csab csac csas cscb cscc cscs cssa csys cya- cyaa cyba cybb cybc cyc- cyca cycb cycc cycs cyy- cyyc sa-c saab saac saas saba sabb sabc sabs saca sacc sacs sacy sasa sasc sass saya says sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scas scay scba sccc sccs sccy scsa scsc ssaa ssab ssac ssas ssby ssca sscc sscs sssa sssb sssc ssss syss yaas yaba yacc yacy yasa yass yaya yays ybas ybbs ycab yccc ycsb ysay ysby ysyb yyyy