aaaa aaab aaap aaas aaba aabb aabp aabt aaoo aapa aapo aaps aapt aasa aass aast aata aatt abaa abab abap abas abat abb- abba abbb abbo abbs abbt aboa abob aboo abos abot abpa abpp abps abs- absa absp abss abta abts aoba aopo aosp aoss apao apap apas apat apba apbs apo- apoo apop apos apot appa apps appt apsa apso apss apta apts aptt asaa asab asao asap asas asat asba asbo asob asop asos asot aspa aspo asps aspt assa asso assp asss asst asta astb asto astp asts at-t ataa atab atap atas atat atbs atob atop atos atot atsb atst atta atto attp atts baaa baas baat baba babb babo babs baos bapa bapp baps bapt basa baso bass bast bata bato bats batt bbas bbbb bbbs boab boas boat boba bobb bobo bobs boob boop boos boot bopa bopp bops bosa boso boss bost bota botb boto bots bott bpot bpsa bsaa bsap bsas bsat bsos bspp bsts btaa btbp btob btps btss bttb oaps oass oast oats obas obba obbo obos obot obss obst obts ooaa ooba oooo ooos oops oosa oost ootb ootp oots opap opo- opos oppa oppo opps opsa opto opts osap osas osat osba osbp osoo osos ossa ossb osso osta osts otap otas otbs oto- otoo otos otpp otsa otso otta otto otts paap paas paat paba pabt paos papa papb papp paps pasa paso pasp pass past pata pato pats patt pbpa pbsa pbsp poas poat poba pobo pobs poop poos poot pop- popa popo popp pops popt posa posb poso poss post pota poto pots pott ppap ppoa ppos pppa pppo pppp ppps ppss ppta ppts pptt psap psas psat psbt psoa psos pspp psps pssa psso psst psts ptab ptas ptop ptsa s-os saab saap saas saat saba sabb sabo sabs saos sapa sapo sapp saps sasa saso sass sast sata satb sato sats satt sbaa sbas sbbs sbot sbsa sbsp sbst soap soas soat soba sobo sobp sobs sobt soop soos soot sopa sopo sopp sops sosa soso soss sost sota soto sotp sots sp-a spap spas spat spoo spop spos spot spps spsa spso spsp spss spst spta sptb spto spts ssaa ssab ssao ssap ssas ssat ssop ssot sspa sspo ssps sspt sssa sssb ssss ssta sstb sstp ssts stab stap stas stat stbs stoa stob stoo stop stos stot stpp stps stss taa- taas taat taba tabb tabo tabs taoa taos tapa tapo tapp taps tapt tasa tasb tasp tass tast tata tatb tato tats tatt tbas tbbs tbsp tbst tbta tbtp toab toas toat toba tobo tobs tobt tooa toos toot top- topa topo topp tops topt tosa tosb toso toss tost tota toto tots tott tpap tppa tppp tpsa tptp tsaa tsao tsat tsob tsop tsos tspo tsps tspt tssa tsst tsts ttab ttbb ttop ttss tttt