aaaa aaab aaas aaba aabb aabt aasa aass aast aata aatt abaa abab abag abas abat abb- abba abbb abbs abbt abs- absa abss abta abts agag agas agat agba agga agsa agsg agst agta agts asaa asab asag asas asat asba asgt assa asss asst asta astb asts at-t ataa atab atas atat atbs atsb atst atta atts baaa baas baat baba babb babs baga bagg bags bagt basa bass bast bata bats batt bbas bbbb bbbs bbga bggs bgst bsaa bsas bsat bsgs bsts btaa btss bttb gaas gaba gabb gabs gabt gaga gagg gags gasa gasb gass gast gata gats gatt gbag gbas gbbs ggbt gggg ggss gsab gsat gtaa gtta saab saag saas saat saba sabb sabs saga sagg sags sagt sasa sass sast sata satb satg sats satt sbaa sbas sbbs sbsa sbst sgaa sggg sggs sgss sgta sgts ssaa ssab ssas ssat ssgs ssgt sssa sssb ssss ssta sstb ssts stab stag stas stat stbs stss taa- taag taas taat taba tabb tabs taga tagg tags tasa tasb tass tast tata tatb tats tatt tbas tbbs tbgs tbst tbta tgts tsaa tsat tsgt tssa tssg tsst tsts ttab ttbb ttss tttt