a-a a-b a-t aaa aab aaf aar aas aat aau ab- aba abb abf abr abs abt abu af- afa afb aff afr afs aft afu ar- ara arb arf arr ars art aru as- asa asb asf asr ass ast asu at- ata atb atf atr ats att atu au- aua aub auf aur aus aut b-u baa bab baf bar bas bat bau bba bbb bbf bbr bbs bbt bbu bfa bfb bff bfr bfs bft bfu bra brb brf brr brs brt bru bsa bsb bsf bsr bss bst bsu bta btb btf btr bts btt btu bua bub buf bur bus but buu faa fab faf far fas fat fau fba fbb fbf fbr fbs fbt fbu ffa fff ffr ffs fft ffu fra frb frf frr frs frt fru fsa fsb fsf fsr fss fst fsu fta ftb ftf ftr fts ftt ftu fua fub fuf fur fus fut fuu ra- raa rab raf rar ras rat rau rba rbb rbf rbr rbs rbt rbu rfa rfb rff rfr rfs rft rfu rra rrb rrf rrr rrs rrt rru rsa rsb rsf rsr rss rst rsu rta rtb rtf rtr rts rtt rtu rua rub ruf rur rus rut ruu saa sab saf sar sas sat sau sba sbb sbf sbr sbs sbt sbu sfa sfb sff sfr sfs sft sfu sr- sra srb srf srr srs srt ss- ssa ssb ssf ssr sss sst ssu sta stb stf str sts stt stu sua sub suf sur sus sut suu taa tab taf tar tas tat tau tba tbb tbf tbr tbs tbt tbu tfa tfb tff tfr tfs tft tfu tra trb trf trr trs trt tru tsa tsb tsf tsr tss tst tsu tta ttb ttf ttr tts ttt ttu tua tub tuf tur tus tut tuu ua- uaa uab uaf uar uas uat uau uba ubb ubf ubr ubs ubt ubu ufa uff ufr ufs uft ufu ur- ura urb urf urr urs urt uru usa usb usf usr uss ust usu uta utb utf utr uts utt utu uua uur uus uut uuu

a-fu aaaa aaab aaaf aaar aaas aaba aabb aabt aafa aafb aaff aara aars aart aaru aasa aasf aass aast aasu aata aatf aatt aaus abaa abab abaf abar abas abat abau abb- abba abbb abbr abbs abbt abff abra abrs abs- absa absf abss absu abta abts abtu abua abuf abus abut afaa afar afat afbs affa affs afft afr- afra afrs afru afsa afsb afst afta afts afua afus arab araf arar aras arat arau arba arbs arfa arfb arff arfs arft arfu arr- arra arrr arrs arrt arru ars- arsa arst arsu arta artr arts arua arub arut asaa asab asaf asar asas asat asau asba asbu asfa asra asrs asru assa assr asss asst assu asta astb astr asts asub asur asus at-t ataa atab atar atas atat atbs atfb atfs atra atru atsb atst atta attr atts attu atua atub atur atus auaa aufs aur- aura ausa aust ausu aut- auts baaa baaf baar baas baat baba babb babr babs babu baff baft bar- bara barb barf barr bars bart baru basa basf bass bast basu bata batf bats batt batu bau- bauf baur bbas bbau bbbb bbbs bfas bffs bfsr bfta bfts bftt brab braf bras brat brau brfu brrr brrs brsb brsr brst brus brut bsaa bsas bsat bsfa bsff bsfs bsra bsts btaa btaf btrt btss bttb btus buar buat buba bubb bubs bubu buff bufr bur- bura burb burr burs burt buru busa buss bust busu but- buta buts butt buus faaa faas faba fabs fabu fafa faff fara farb farr fars fart faru fasa fass fast fata fatf fats fatt faur faut fbar fbrs fbus ffar ffff ffrr ffsa ffss fftf frab fras frat frau frsb frst frta frub fsas fsra fssa fssf fsta ftrs ftsa ftsr ftub fuar fuat fubb fubs fubu fuff fufu fur- fura furr furs furt fusa fuss fust fusu futa futs futu raab raaf raas raat raba rabb rabs rabu rafa raff raft rara rarb rarf rars rasa rass rast rasu rata ratf rats ratt ratu raua raub rauf raus raut rbaf rbbb rbbr rbbs rbss rbst rras rrat rrrr rsaa rsaf rssa rsts rstu rsua rtas rtbf rtfb rtss rtts ruas ruba rubb rubs rubu rufa ruff ruft rura rurs ruru rusa russ rust rusu ruta ruts rutt rutu saab saaf saar saas saat saba sabb sabr sabs sabu safa safb saff safr saft safu sara sarf sarr sars sart saru sasa sasf sass sast sata satb satr sats satt satu saua sauf saur saus saut sbaa sbar sbas sbbs sbsa sbst sbus sfar sfas sfba sfra sfss sfsu sfts sraf sras srta srtr srub ssaa ssab ssas ssat ssau ssbr ssra ssrs sssa sssb sssf ssss ssta sstb ssts stab star stas stat stau stbs stfu stra strs stru stsf stss sttr stub stuf stur stus stut suar suas suat sub- suba subb subs suf- sufa suff sufr sufs sufu sur- sura surf surr surs surt suru sus- susa suss sust susu suta sutu suus taa- taaf taar taas taat taba tabb tabs tabu tafa taff taft tara tarb tarf tarr tars tart taru tasa tasb tasr tass tast tasu tata tatb tatr tats tatt tatu taua taub taur taus taut tbaf tbar tbas tbbs tbrb tbst tbta tfrs tfss traa trab traf tras trat trau trfr trra trst trtr trub trus trut truu tsaa tsar tsat tsau tssa tssf tssr tsst tsts ttab ttbb ttfa ttff ttss tttt tuar tuas tuat tuba tubb tubr tubs tubu tufa tuff tuft tufu tura turb turf turr turs turt turu tusa tuss tust tuta tuts tutt tutu uafa uars uart uaru uasa uata uatu uaua ubar ubba ubra ubtf uffa ufra uras urat urau urba urbs urfa urff urft urra ursa urss ursu urts urur urus urut us-a usaa usaf usar usas usat usba usbr usbs usfa usfs usra ussa ussb ussf ussr