a-a a-b a-t aaa aab aaf aao aap aar aas aat ab- aba abb abf abo abp abr abs abt af- afa afb aff afo afp afr afs aft aoa aob aof aoo aop aor aos aot ap- apa apb apf apo app apr aps apt ar- ara arb arf aro arp arr ars art as- asa asb asf aso asp asr ass ast at- ata atb atf ato atp atr ats att b-p baa bab baf bao bap bar bas bat bba bbb bbf bbo bbp bbr bbs bbt bfa bfb bff bfo bfp bfr bfs bft boa bob bof boo bop bor bos bot bpa bpb bpf bpo bpp bpr bps bpt bra brb brf bro brp brr brs brt bsa bsb bsf bso bsp bsr bss bst bta btb btf bto btp btr bts btt faa fab faf fao fap far fas fat fba fbb fbf fbo fbp fbr fbs fbt ffa fff ffo ffp ffr ffs fft foa fob fof foo fop for fos fot fpa fpb fpo fpp fpr fps fpt fra frb frf fro frp frr frs frt fsa fsb fsf fso fsp fsr fss fst fta ftb ftf fto ftp ftr fts ftt oaa oab oaf oao oap oar oas oat ob- oba obb obf obo obp obr obs obt of- ofa ofb off ofo ofp ofr ofs oft oo- ooa oob oof ooo oop oor oos oot op- opa opb opf opo opp opr ops opt or- ora orb orf oro orp orr ors ort os- osa osb osf oso osp osr oss ost ot- ota otb otf oto otp otr ots ott p-p paa pab paf pao pap par pas pat pba pbb pbf pbo pbp pbr pbs pbt pfa pfb pff pfo pfp pfr pfs pft poa pob pof poo pop por pos pot ppa ppb ppf ppo ppp ppr pps ppt pra prb prf pro prp prr prs prt ps- psa psb psf pso psp psr pss pst pt- pta ptb ptf pto ptp ptr pts ptt ra- raa rab raf rao rap rar ras rat rba rbb rbf rbo rbp rbr rbs rbt rfa rfb rff rfo rfp rfr rfs rft roa rob rof roo rop ror ros rot rpa rpb rpf rpo rpp rpr rps rpt rra rrb rrf rrp rrr rrs rrt rsa rsb rsf rso rsp rsr rss rst rta rtb rtf rto rtp rtr rts rtt saa sab saf sao sap sar sas sat sba sbb sbf sbo sbp sbr sbs sbt sfa sfb sff sfo sfp sfr sfs sft soa sob sof soo sop sor sos sot spa spb spf spo spp spr sps spt sr- sra srb srf sro srp srr srs srt ss- ssa ssb ssf sso ssp ssr sss sst sta stb stf sto stp str sts stt taa tab taf tao tap tar tas tat tba tbb tbf tbo tbp tbr tbs tbt tfa tfb tff tfo tfp tfr tfs tft to- toa tob tof too top tor tos tot tpa tpb tpf tpo tpp tpr tps tpt tra trb trf tro trp trr trs trt tsa tsb tsf tso tsp tsr tss tst tta ttb ttf tto ttp ttr tts ttt

aaaa aaab aaaf aaap aaar aaas aaba aabb aabp aabt aafa aafb aaff aaoo aapa aapo aaps aapt aara aaro aarp aars aart aasa aasf aass aast aata aatf aatt abaa abab abaf abap abar abas abat abb- abba abbb abbo abbr abbs abbt abff aboa abob abof aboo abor abos abot abpa abpp abpr abps abra abro abrs abs- absa absf absp abss abta abts afaa afao afap afar afat afbs affa affo affs afft afoa afoo afor afpa afr- afra afro afrs afsa afsb afsp afst afta aftp afts aoba aopo aora aorb aors aort aosp aoss aotf apao apap apar apas apat apba apbr apbs apfa apfo apft apo- apof apoo apop apor apos apot appa appr apps appt apra apro aprs aprt apsa apso apss apta apts aptt arab araf arap arar aras arat arba arbs arfa arfb arff arfs arft aroa arob aroo aror aros arpa arps arr- arra arro arrr arrs arrt ars- arsa arso arst arta arto artr arts asaa asab asaf asao asap asar asas asat asba asbo asfa asob asof 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 atfb atfs atob atof atop ator atos atot atpr atra atro atrp atsb atst atta atto attp attr atts baaa baaf baar baas baat baba babb babo babr babs baff bafo baft baos bapa bapp baps bapt bar- bara barb barf baro barr bars bart basa basf baso bass bast bata batf bato bats batt bbas bbbb bbbs bbpr bfas bffs bfpo bfpp bfsr bfta bfts bftt boab boar boas boat boba bobb bobo bobs bofa boff bofs boob boof boop boor boos boot bopa bopp bops bor- bora borf boro borr bors bort bosa boso boss bost bota botb boto bots bott bpot bpsa bptf brab braf brao bras brat broa brob broo bror bros brot brrr brrs brsb brsr brst bsaa bsap bsas bsat bsfa bsff bsfs bsos bspp bspr bsra bsts btaa btaf btbp btob btor btps btrt btss bttb faaa faap faas faba fabo fabs fafa faff fafo fapa fapp faps fara farb faro farp farr fars fart fasa faso fass fast fata fatf fato fats fatt fbar fbop fbrs ffar ffff ffps ffrr ffsa ffss fftf foaf foar foba fobs fobt fofo foof foos foot fopp fops for- fora forb foro forr fors fort fosa fosb foso foss fost fota foto fotp fots fott fpaa fpas fpra fprf frab frap fras frat frob frop fros frot frps frsb frso frst frta fsas fsfo fspf fsra fssa fssf fssp fsta ftop ftos ftps ftrs ftsa ftsr oafo oafs oaps oara oars oass oast oats obas obba obbo obor obos obot obra obro