a-a a-b a-t aaa aab aao aap aar aas aat ab- aba abb abo abp abr abs abt aoa aob aoo aop aor aos aot ap- apa apb apo app apr aps apt ar- ara arb aro arp arr ars art as- asa asb aso asp asr ass ast at- ata atb ato atp atr ats att b-p baa bab bao bap bar bas bat bba bbb bbo bbp bbr bbs bbt boa bob boo bop bor bos bot bpa bpb bpo bpp bpr bps bpt bra brb bro brp brr brs brt bsa bsb bso bsp bsr bss bst bta btb bto btp btr bts btt oaa oab oao oap oar oas oat ob- oba obb obo obp obr obs obt oo- ooa oob ooo oop oor oos oot op- opa opb opo opp opr ops opt or- ora orb oro orp orr ors ort os- osa osb oso osp osr oss ost ot- ota otb oto otp otr ots ott p-p paa pab pao pap par pas pat pba pbb pbo pbp pbr pbs pbt poa pob poo pop por pos pot ppa ppb ppo ppp ppr pps ppt pra prb pro prp prr prs prt ps- psa psb pso psp psr pss pst pt- pta ptb pto ptp ptr pts ptt ra- raa rab rao rap rar ras rat rba rbb rbo rbp rbr rbs rbt roa rob roo rop ror ros rot rpa rpb rpo rpp rpr rps rpt rra rrb rrp rrr rrs rrt rsa rsb rso rsp rsr rss rst rta rtb rto rtp rtr rts rtt saa sab sao sap sar sas sat sba sbb sbo sbp sbr sbs sbt soa sob soo sop sor sos sot spa spb spo spp spr sps spt sr- sra srb sro srp srr srs srt ss- ssa ssb sso ssp ssr sss sst sta stb sto stp str sts stt taa tab tao tap tar tas tat tba tbb tbo tbp tbr tbs tbt to- toa tob too top tor tos tot tpa tpb tpo tpp tpr tps tpt tra trb tro trp trr trs trt tsa tsb tso tsp tsr tss tst tta ttb tto ttp ttr tts ttt

aaaa aaab aaap aaar aaas aaba aabb aabp aabt aaoo aapa aapo aaps aapt aara aaro aarp aars aart aasa aass aast aata aatt abaa abab abap abar abas abat abb- abba abbb abbo abbr abbs abbt aboa abob aboo abor abos abot abpa abpp abpr abps abra abro abrs abs- absa absp abss abta abts aoba aopo aora aorb aors aort aosp aoss apao apap apar apas apat apba apbr apbs apo- apoo apop apor apos apot appa appr apps appt apra apro aprs aprt apsa apso apss apta apts aptt arab arap arar aras arat arba arbs aroa arob aroo aror aros arpa arps arr- arra arro arrr arrs arrt ars- arsa arso arst arta arto artr arts asaa asab asao asap asar asas asat asba asbo asob asop asor asos asot aspa aspo aspr asps aspt asra asro asrs assa asso assp assr asss asst asta astb asto astp astr asts at-t ataa atab atap atar atas atat atbs atob atop ator atos atot atpr atra atro atrp atsb atst atta atto attp attr atts baaa baar baas baat baba babb babo babr babs baos bapa bapp baps bapt bar- bara barb baro barr bars bart basa baso bass bast bata bato bats batt bbas bbbb bbbs bbpr boab boar boas boat boba bobb bobo bobs boob boop boor boos boot bopa bopp bops bor- bora boro borr bors bort bosa boso boss bost bota botb boto bots bott bpot bpsa brab brao bras brat broa brob broo bror bros brot brrr brrs brsb brsr brst bsaa bsap bsas bsat bsos bspp bspr bsra bsts btaa btbp btob btor btps btrt btss bttb oaps oara oars oass oast oats obas obba obbo obor obos obot obra obro obsr obss obst obts ooaa ooba oooo ooos oops oora oort oosa oost ootb ootp oots opap opar opo- opor opos oppa oppo opps opra opsa opto opts orab orao orar oras orat orba orbb orbo orbs oro- oror oros orot orps orra orro orrs orsa orso orta orto orts osap osar osas osat osba osbp osoo osor osos osro ossa ossb osso osta ostr osts otap otar otas otbs oto- otoo otor otos otpp otra otro otrs otsa otso otta otto otts paap paar paas paat paba pabt paos papa papb papp papr paps par- para paro parp parr pars part pasa paso pasp pass past pata pato patr pats patt pbar pbpa pbrs pbsa pbsp poar poas poat poba pobo pobs poop poor poos poot pop- popa popo popp pops popt pora porb poro porr pors port posa posb poso poss post pota poto pots pott ppap ppar ppoa ppos pppa pppo pppp ppps ppss ppta ppts pptt prao prar pras prat prbs pro- proa prob proo prop pros prot prps prrs prsa prso prss prtp prtr psap psas psat psbr psbt psoa psos pspp pspr psps psrp pssa psso psst psts ptab ptas ptop ptsa raab raas raat raba rabb rabo rabs raob raop raos rapa rapp raps rapt rara rarb raro rars rasa raso rasp rass rast rata rato ratp rats ratt rbbb rbbr rbbs rbsp rbss rbst roab roap roar roas roat rob- roba robb robo robs robt roob roop roor roos root ropa ropo rops rora roro rort rosa roso rosp ross rost rota roto rotr rots rott rpob rpos rpps rpta rpts rras rrat rrrr rrsp rsaa rsos rspb rspo rsps rssa rstp rsts rtas rtpa rtps rtss rttp rtts s-os saab saap saar saas saat saba sabb sabo sabr sabs saor saos sapa sapo sapp saps sara saro sarp sarr sars sart sasa saso sass sast sata satb sato satr sats satt sbaa sbar sbas sbbs sbor sbot sbsa sbsp sbst soap soar soas soat soba sobo sobp sobr sobs sobt soop soor soos soot sopa sopo sopp