a-a a-b a-t aaa aab aaf aao aar aas aat ab- aba abb abf abo abr abs abt af- afa afb aff afo afr afs aft aoa aob aof aoo aor aos aot ar- ara arb arf aro arr ars art as- asa asb asf aso asr ass ast at- ata atb atf ato atr ats att baa bab baf bao bar bas bat bba bbb bbf bbo bbr bbs bbt bfa bfb bff bfo bfr bfs bft boa bob bof boo bor bos bot bra brb brf bro brr brs brt bsa bsb bsf bso bsr bss bst bta btb btf bto btr bts btt faa fab faf fao far fas fat fba fbb fbf fbo fbr fbs fbt ffa fff ffo ffr ffs fft foa fob fof foo for fos fot fra frb frf fro frr frs frt fsa fsb fsf fso fsr fss fst fta ftb ftf fto ftr fts ftt oaa oab oaf oao oar oas oat ob- oba obb obf obo obr obs obt of- ofa ofb off ofo ofr ofs oft oo- ooa oob oof ooo oor oos oot or- ora orb orf oro orr ors ort os- osa osb osf oso osr oss ost ot- ota otb otf oto otr ots ott ra- raa rab raf rao rar ras rat rba rbb rbf rbo rbr rbs rbt rfa rfb rff rfo rfr rfs rft roa rob rof roo ror ros rot rra rrb rrf rrr rrs rrt rsa rsb rsf rso rsr rss rst rta rtb rtf rto rtr rts rtt saa sab saf sao sar sas sat sba sbb sbf sbo sbr sbs sbt sfa sfb sff sfo sfr sfs sft soa sob sof soo sor sos sot sr- sra srb srf sro srr srs srt ss- ssa ssb ssf sso ssr sss sst sta stb stf sto str sts stt taa tab taf tao tar tas tat tba tbb tbf tbo tbr tbs tbt tfa tfb tff tfo tfr tfs tft to- toa tob tof too tor tos tot tra trb trf tro trr trs trt tsa tsb tsf tso tsr tss tst tta ttb ttf tto ttr tts ttt

aaaa aaab aaaf aaar aaas aaba aabb aabt aafa aafb aaff aaoo aara aaro aars aart aasa aasf aass aast aata aatf aatt abaa abab abaf abar abas abat abb- abba abbb abbo abbr abbs abbt abff aboa abob abof aboo abor abos abot abra abro abrs abs- absa absf abss abta abts afaa afao afar afat afbs affa affo affs afft afoa afoo afor afr- afra afro afrs afsa afsb afst afta afts aoba aora aorb aors aort aoss aotf arab araf arar aras arat arba arbs arfa arfb arff arfs arft aroa arob aroo aror aros arr- arra arro arrr arrs arrt ars- arsa arso arst arta arto artr arts asaa asab asaf asao asar asas asat asba asbo asfa asob asof asor asos asot asra asro asrs assa asso assr asss asst asta astb asto astr asts at-t ataa atab atar atas atat atbs atfb atfs atob atof ator atos atot atra atro atsb atst atta atto attr atts baaa baaf baar baas baat baba babb babo babr babs baff bafo baft baos bar- bara barb barf baro barr bars bart basa basf baso bass bast bata batf bato bats batt bbas bbbb bbbs bfas bffs bfsr bfta bfts bftt boab boar boas boat boba bobb bobo bobs bofa boff bofs boob boof boor boos boot bor- bora borf boro borr bors bort bosa boso boss bost bota botb boto bots bott brab braf brao bras brat broa brob broo bror bros brot brrr brrs brsb brsr brst bsaa bsas bsat bsfa bsff bsfs bsos bsra bsts btaa btaf btob btor btrt btss bttb faaa faas faba fabo fabs fafa faff fafo fara farb faro farr fars fart fasa faso fass fast fata fatf fato fats fatt fbar fbrs ffar ffff ffrr ffsa ffss fftf foaf foar foba fobs fobt fofo foof foos foot for- fora forb foro forr fors fort fosa fosb foso foss fost fota foto fots fott frab fras frat frob fros frot frsb frso frst frta fsas fsfo fsra fssa fssf fsta ftos ftrs ftsa ftsr oafo oafs oara oars oass oast oats obas obba obbo obor obos obot obra obro obsr obss obst obts ofas off- offa offo offr offs ofor ofra ofst ofta ooaa ooba ooff oofs oooo ooos oora oort oosa oost ootb oots orab orao orar oras orat orba orbb orbo orbs orff orfs oro- orof oror oros orot orra orro orrs orsa orso orta orto orts osaf osar osas osat osba osfa osoo osor osos osro ossa ossb osso osta ostr osts otar otas otbs oto- otof otoo otor otos otra otro otrs otsa otso otta otto otts raab raaf raas raat raba rabb rabo rabs rafa raff raft raob raos rara rarb rarf raro rars rasa raso rass rast rata ratf rato rats ratt rbaf rbbb rbbr rbbs rbss rbst roab roaf roar roas roat rob- roba robb robo robs robt roff rofo roob roof roor roos root rora roro rort rosa roso ross rost rota roto rotr rots rott rras rrat rrrr rsaa rsaf rsos rssa rsts rtas rtbf rtfb rtss rtts s-os saab saaf saar saas saat saba sabb sabo sabr sabs safa safb saff safo safr saft saor saos sara sarf saro sarr sars sart sasa sasf saso sass sast sata satb sato satr sats satt sbaa sbar sbas sbbs sbor sbot sbsa sbst sfar sfas sfba sfor sfos sfra sfro sfss sfts soar soas soat soba sobo sobr sobs sobt sofa sofo soft soof soor soos soot sora sorb soro sorr sors sort sosa soso soss sost sota soto sots sraf sras sros srta srtr ssaa ssab ssao ssas ssat ssbr ssot ssra ssrs sssa sssb sssf ssss ssta sstb ssts stab star stas stat stbs stoa stob stof stoo stor stos stot stra stro strs stsf stss sttr taa- taaf taar taas taat