aaaa aaab aaad aaas aaba aabb aabd aabt aada aads aadt aasa aasd aass aast aata aatt abaa abab abad abas abat abb- abba abbb abbs abbt abda abs- absa absd abss abta abts adaa adab adad adas adat adba adda addd adds adsa adss adst adta adts asaa asab asad asas asat asba asda asds assa assd asss asst asta astb asts at-t ataa atab atad atas atat atbs atdt atsb atst atta atts baaa baad baas baat baba babb babs bada badb badd bads basa bass bast bata bats batt bbad bbas bbbb bbbs bbdd bdsd bsaa bsas bsat bsbd bssd bsts btaa btdt btss bttb daab daad daas daba dabb dabs dabt dada dads dasa dasb dasd dass dast data dats datt dbas dbsa dbss dbtt dddd ddss ddts dsba dsda dssa dsst dsts dtaa dtss saab saad saas saat saba sabb sabs sada sadb sadd sads sadt sasa sasd sass sast sata satb satd sats satt sbaa sbas sbbs sbds sbsa sbsd sbst sdba sdds sdss ssaa ssab ssas ssat ssdd sssa sssb ssss ssta sstb sstd ssts stab stad stas stat stbd stbs stds stss sttd taa- taas taat taba tabb tabs tada tads tasa tasb tass tast tata tatb tats tatt tbas tbbs tbst tbta tddb tdss tsaa tsat tsbd tsdb tssa tsst tsts ttab ttbb ttss tttt