a-wa aaaa aaab aaas aaba aabb aabt aabw aasa aass aast aata aatt aatw aawt aaww abaa abab abas abat abaw abb- abba abbb abbs abbt abs- absa abss absw abta abts abwa asaa asab asas asat asba assa asss asst asta astb asts at-t ataa atab atas atat atbs atsb atst atta atts atwa atws atwt awas awss awst awts awwa awws baaa baas baat baba babb babs basa bass bast bata bats batt baw- baws bbas bbbb bbbs bbws bsaa bsas bsat bsaw bsts btaa btss bttb bwaa saab saas saat saba sabb sabs sasa sass sast sata satb sats satt sawa saws sawt sbaa sbas sbbs sbsa sbst ssaa ssab ssas ssat ssaw sssa sssb ssss ssta sstb ssts ssws stab stas stat staw stbs stss swab swas swat swbs swbw swss swts taa- taas taat taba tabb tabs tasa tasb tass tast tata tatb tats tatt tawa taws tawt taww tbas tbbs tbst tbta tsaa tsat tssa tsst tsts tswa ttab ttbb ttss tttt twas twat twbt twss waaa waas waat waaw waba wabb wabs wabt wabw wasa wasb wass wast wata watb wats watt watw wawa wawb waws wawt wbaa wbab wbat wbbb wbbs wbbt wbbw wbsa wbsb wbss wbst wbsw wbta wbts wbtt wbtw wbwb wbwt wsaa wsat wsba wsbb wsbs wsbt wsbw wsss wsst wssw wsta wstb wsts wstt wstw wswb wsws wswt wsww wtab wtaw wtbb wtbs wtsa wtsb wtss wtta wttb wtts wttt wttw wtwa wtwb wtws wtwt wtww wwab wwba wwbb wwbt wwsb wwss wwst wwta wwtw wwwa wwws wwww