a-a a-b aaa aab aaf aao aar aas aau ab- aba abb abf abo abr abs abu af- afa afb aff afo afr afs afu aoa aob aof aoo aor aos aou ar- ara arb arf aro arr ars aru as- asa asb asf aso asr ass asu au- aua aub auf auo aur aus b-u baa bab baf bao bar bas bau bba bbb bbf bbo bbr bbs bbu bfa bfb bff bfo bfr bfs bfu boa bob bof boo bor bos bou bra brb brf bro brr brs bru bsa bsb bsf bso bsr bss bsu bua bub buf buo bur bus buu faa fab faf fao far fas fau fba fbb fbf fbo fbr fbs fbu ffa fff ffo ffr ffs ffu foa fob fof foo for fos fou fra frb frf fro frr frs fru fsa fsb fsf fso fsr fss fsu fua fub fuf fuo fur fus fuu oaa oab oaf oao oar oas oau ob- oba obb obf obo obr obs obu of- ofa ofb off ofo ofr ofs ofu oo- ooa oob oof ooo oor oos or- ora orb orf oro orr ors oru os- osa osb osf oso osr oss osu ou- oua ouf ouo our ous ra- raa rab raf rao rar ras rau rba rbb rbf rbo rbr rbs rbu rfa rfb rff rfo rfr rfs rfu roa rob rof roo ror ros rou rra rrb rrf rrr rrs rru rsa rsb rsf rso rsr rss rsu rua rub ruf ruo rur rus ruu saa sab saf sao sar sas sau sba sbb sbf sbo sbr sbs sbu sfa sfb sff sfo sfr sfs sfu soa sob sof soo sor sos sou sr- sra srb srf sro srr srs ss- ssa ssb ssf sso ssr sss ssu sua sub suf suo sur sus suu ua- uaa uab uaf uao uar uas uau uba ubb ubf ubo ubr ubs ubu ufa uff ufo ufr ufs ufu uoa uob uoo uor uos ur- ura urb urf uro urr urs uru usa usb usf uso usr uss usu uua uur uus uuu

-ous a-fu aaaa aaab aaaf aaar aaas aaba aabb aafa aafb aaff aaoo aara aaro aars aaru aasa aasf aass aasu aaus abaa abab abaf abar abas abau abb- abba abbb abbo abbr abbs abff aboa abob abof aboo abor abos abou abra abro abrs abs- absa absf abss absu abua abuf abus afaa afao afar afbs affa affo affs afoa afoo afor afr- afra afro afrs afru afsa afsb afua afus aoba aora aorb aors aoss aouf aous arab araf arar aras arau arba arbs arfa arfb arff arfs arfu aroa arob aroo aror aros arr- arra arro arrr arrs arru ars- arsa arso arsu arua arub asaa asab asaf asao asar asas asau asba asbo asbu asfa asob asof asor asos asou asra asro asrs asru assa asso assr asss assu asub asur asus auaa aufs aur- aura auro ausa ausu baaa baaf baar baas baba babb babo babr babs babu baff bafo baos bar- bara barb barf baro barr bars baru basa basf baso bass basu bau- bauf baur bbas bbau bbbb bbbs bfas bffs bfsr boab boar boas boba bobb bobo bobs bobu bofa boff bofs bofu boob boof boor boos bor- bora borf boro borr bors boru bosa boso boss bosu boua bouf bour bous brab braf brao bras brau brfu broa brob broo bror bros brou brrr brrs brsb brsr brus bsaa bsas bsfa bsff bsfs bsos bsra buar buba bubb bubo bubs bubu buff bufo bufr bur- bura burb buro burr burs buru busa buss busu buus faaa faas faba fabo fabs fabu fafa faff fafo fara farb faro farr fars faru fasa faso fass faur fbar fbrs fbus ffar ffff ffrr ffsa ffss foaf foar foba fobs fofo foof foos for- fora forb foro forr fors fosa fosb foso foss foua four fous frab fras frau frob fros frou frsb frso frub fsas fsfo fsra fssa fssf fuar fubb fubs fubu fuff fufu fuor fur- fura furo furr furs fusa fuso fuss fusu oaau oafo oafs oara oars oass obas obba obbo obor obos obra obro obsr obss obus ofas off- offa offo offr offs offu ofor ofra ofus ooaa ooba ooff oofs oooo ooos oora oosa oous orab orao orar oras orba orbb orbo orbs orbu orff orfs orfu oro- orof oror oros orra orro orrs orsa orso orsu orub orus osaf osar osas osba osfa osoo osor osos osro ossa ossb osso ossu oubs ouff our- oura ouro ours ousa ouu- raab raaf raas raba rabb rabo rabs rabu rafa raff raob raos rara rarb rarf raro rars rasa raso rass rasu raua raub rauf raus rbaf rbbb rbbr rbbs rbss roab roaf roar roas rob- roba robb robo robs robu roff rofo roob roof roor roos rora roro roru rosa roso ross roua roub rouf rous rras rrrr rsaa rsaf rsos rssa rsua ruas ruba rubb rubs rubu rufa ruff rufo rura ruro rurs ruru rusa ruso russ rusu s-os saab saaf saar saas saba sabb sabo sabr sabs sabu safa safb saff safo safr safu saor saos saou sara sarf saro sarr sars saru sasa sasf saso sass saua sauf saur saus sbaa sbar sbas sbbs sbor sbsa sbus sfar sfas sfba sfor sfos sfra sfro sfss sfsu soar soas soba sobo sobr sobs sobu sofa sofo soof soor soos sora sorb soro sorr sors soru sosa soso soss souf sour sous sraf sras sros srub ssaa ssab ssao ssas ssau ssbr ssra ssrs sssa sssb sssf ssss suar suas sub- suba subb subo subs suf- sufa suff sufr sufs sufu suor suos sur- sura surf suro surr surs suru sus- susa suso suss susu suus uafa uars uaru uasa uaua ubar ubba ubbo ubos ubra uffa ufos ufra uofa uofo uor- urao uras urau urba urbs urfa urff uro- uroa uroo urra ursa urso urss ursu urur urus us-a usaa usaf usar usas usba usbr usbs usfa usfs