-ana aaaa aaab aaan aaas aaba aabb aabt aana aasa aass aast aata aatt abaa abab aban abas abat abb- abba abbb abbs abbt abs- absa abss abta abts ana- anaa anab anan anas anat anba anbb anna annb anns annt ansa ant- anta ants antt asaa asab asan asas asat asba assa assn asss asst asta astb asts at-t ataa atab atan atas atat atbs atna atns atsb atst atta attn atts baaa baan baas baat baba babb babs bana bann bans bant basa bass bast bata batn bats batt bbas bbbb bbbs bnas bnss bnta bsaa bsas bsat bsns bsts btaa btan btss bttb naaa naab naan naas naat naba nabs nan- nana nanb nann nans nant nas- nasa nasb nass nast nata nats natt nbaa nbas nnnn nnsa nnss nntn nsaa nsna nssa nssb nsss nsts ntsb ntss saab saan saas saat saba sabb sabs sana sann sans sant sasa sass sast sata satb satn sats satt sbaa sbas sbbs sbsa sbst sbtn snab snas snat snba snns ssaa ssab ssan ssas ssat ssbn ssns sssa sssb ssss ssta sstb ssts stab stan stas stat stbs stnn stns stss taa- taan taas taat taba tabb tabs tana tann tans tant tasa tasb tass tast tata tatb tats tatt tbas tbbs tbst tbta tnts tsaa tsat tsna tssa tsst tsts ttab ttbb ttss tttt