aaaa aaab aaar aaas aaba aabb aabt aaoo aara aaro aars aart aasa aass aast aata aatt abaa abab abar abas abat abb- abba abbb abbo abbr abbs abbt aboa abob aboo abor abos abot abra abro abrs abs- absa abss abta abts aoba aora aorb aors aort aoss arab arar aras arat arba arbs aroa arob aroo aror aros arr- arra arro arrr arrs arrt ars- arsa arso arst arta arto artr arts asaa asab asao asar asas asat asba asbo asob asor asos asot asra asro asrs assa asso assr asss asst asta astb asto astr asts at-t ataa atab atar atas atat atbs atob ator atos atot atra atro atsb atst atta atto attr atts baaa baar baas baat baba babb babo babr babs baos bar- bara barb baro barr bars bart basa baso bass bast bata bato bats batt bbas bbbb bbbs boab boar boas boat boba bobb bobo bobs boob boor boos boot bor- bora boro borr bors bort bosa boso boss bost bota botb boto bots bott brab brao bras brat broa brob broo bror bros brot brrr brrs brsb brsr brst bsaa bsas bsat bsos bsra bsts btaa btob btor btrt btss bttb oara oars oass oast oats obas obba obbo obor obos obot obra obro obsr obss obst obts ooaa ooba oooo ooos oora oort oosa oost ootb oots orab orao orar oras orat orba orbb orbo orbs oro- oror oros orot orra orro orrs orsa orso orta orto orts osar osas osat osba osoo osor osos osro ossa ossb osso osta ostr osts otar otas otbs oto- otoo otor otos otra otro otrs otsa otso otta otto otts raab raas raat raba rabb rabo rabs raob raos rara rarb raro rars rasa raso rass rast rata rato rats ratt rbbb rbbr rbbs rbss rbst roab roar roas roat rob- roba robb robo robs robt roob roor roos root rora roro rort rosa roso ross rost rota roto rotr rots rott rras rrat rrrr rsaa rsos rssa rsts rtas rtss rtts s-os saab saar saas saat saba sabb sabo sabr sabs saor saos sara saro sarr sars sart sasa saso sass sast sata satb sato satr sats satt sbaa sbar sbas sbbs sbor sbot sbsa sbst soar soas soat soba sobo sobr sobs sobt soor soos soot sora sorb soro sorr sors sort sosa soso soss sost sota soto sots sras sros srta srtr ssaa ssab ssao ssas ssat ssbr ssot ssra ssrs sssa sssb ssss ssta sstb ssts stab star stas stat stbs stoa stob stoo stor stos stot stra stro strs stss sttr taa- taar taas taat taba tabb tabo tabs taoa taor taos tara tarb taro tarr tars tart tasa tasb tasr tass tast tata tatb tato tatr tats tatt tbar tbas tbbs tbrb tbst tbta toab toas toat toba tobo tobs tobt tooa toor toos toot tora toro torr tors tort tosa tosb toso toss tost tota toto totr tots tott traa trab trao tras trat troa troo tros trot trra trst trtr tsaa tsao tsar tsat tsob tsos tssa tssr tsst tsts ttab ttbb ttss tttt