b-u bbb bbf bbo bbr bbs bbu bfb bff bfo bfr bfs bfu bob bof boo bor bos bou brb brf bro brr brs bru bsb bsf bso bsr bss bsu bub buf buo bur bus buu fbb fbf fbo fbr fbs fbu fff ffo ffr ffs ffu fob fof foo for fos fou frb frf fro frr frs fru fsb fsf fso fsr fss fsu fub fuf fuo fur fus fuu ob- obb obf obo obr obs obu of- ofb off ofo ofr ofs ofu oo- oob oof ooo oor oos or- orb orf oro orr ors oru os- osb osf oso osr oss osu ou- ouf ouo our ous rbb rbf rbo rbr rbs rbu rfb rff rfo rfr rfs rfu rob rof roo ror ros rou rrb rrf rrr rrs rru rsb rsf rso rsr rss rsu rub ruf ruo rur rus ruu sbb sbf sbo sbr sbs sbu sfb sff sfo sfr sfs sfu sob sof soo sor sos sou sr- srb srf sro srr srs ss- ssb ssf sso ssr sss ssu sub suf suo sur sus suu ubb ubf ubo ubr ubs ubu uff ufo ufr ufs ufu uob uoo uor uos ur- urb urf uro urr urs uru usb usf uso usr uss usu uur uus uuu

-ous bbbb bbbs bffs bfsr bobb bobo bobs bobu boff bofs bofu boob boof boor boos bor- borf boro borr bors boru boso boss bosu bouf bour bous brfu brob broo bror bros brou brrr brrs brsb brsr brus bsff bsfs bsos bubb bubo bubs bubu buff bufo bufr bur- burb buro burr burs buru buss busu buus fbrs fbus ffff ffrr ffss fobs fofo foof foos for- forb foro forr fors fosb foso foss four fous frob fros frou frsb frso frub fsfo fssf fubb fubs fubu fuff fufu fuor fur- furo furr furs fuso fuss fusu obbo obor obos obro obsr obss obus off- offo offr offs offu ofor ofus ooff oofs oooo ooos oous orbb orbo orbs orbu orff orfs orfu oro- orof oror oros orro orrs orso orsu orub orus osoo osor osos osro ossb osso ossu oubs ouff our- ouro ours ouu- rbbb rbbr rbbs rbss rob- robb robo robs robu roff rofo roob roof roor roos roro roru roso ross roub rouf rous rrrr rsos rubb rubs rubu ruff rufo ruro rurs ruru ruso russ rusu s-os sbbs sbor sbus sfor sfos sfro sfss sfsu sobo sobr sobs sobu sofo soof soor soos sorb soro sorr sors soru soso soss souf sour sous sros srub ssbr ssrs sssb sssf ssss sub- subb subo subs suf- suff sufr sufs sufu suor suos sur- surf suro surr surs suru sus- suso suss susu suus ubbo ubos ufos uofo uor- urbs urff uro- uroo urso urss ursu urur urus usbr usbs usfs usos ussb ussf ussr usss ussu usus uuuu

bbuss bo-bo bobos bobr boffo boffs boobs boofs boors booru borbo boro- boroo boros borou borro borsu borus bosor bosso bours brobo brobs broos bross brous brrrr bruff bruss bsous buffo buffs bufos burbs buroo buros burro burrs burru burus busso bussu busur busuu fofos forbs foros forro forso forss forur forus fourb fouro fours frobs fu-fu fubbs fubus fuffs furbo furo- furor furrs furus fuso- fusor fusus o-r-b oboro offof ofosu ofour ooooo orbus orfor orobo oroso orosu oruro ososo ossos ossur osusu ouoro ro-ro robbo robbs robo- robor robur rofor roofs rorbu rosso rosss rosu rsssf rubof rubor rubus ruffo ruffs rufo- rufus rusor russo s-bus s-o-r sfouf so-so sobor sooru sorbo sorbs soror soros sorso sorsu sorus soss- sosus souff sours sous- sroof sssrb sssss subbu subos subss suffr suffs surbo surfs surur surus susso susus ubobo ufofu uforb urbos uroob uros urour urous ursus urubu usfor usour uuuuu

bbbbbb bobbos boffos bofors booboo boorus borbor bororo bososo bossou boubou bourou bousso boussu brosso brubru brusor bububu buffos burbur burros foboff foofoo foofur forros fosso fossor foufou fourof fourou frbroo furfur furors furour furrfu fusors obsorb oooooo orobus orrour ossous ououso ousrou robous robsof rofors ruboff rubro- ruffus rufous russo- russus sobos soosoo sorbus sorors sorous sorrus sorsor sourou sousou sssfrs subfor suburb suroso susurr ubussu urobos

bbbbbbb bobross boo-boo booboos boubous bourrou brosour burruss bus-obo fobsoff foo-foo fossors fou-fou furrour off-off oroboro robosub rub-off rubbour sorfors sou-sou soursob sssssss subroof subsfor suburbs suursoo ububboo usurous

bbbbbbbb bo-bo-bo bobobobs bofossou bourrous broubrou buruburu fosforus fourbour froufrou oroborus sussurus susurrus ubbubboo uroboros

borborbor four-four frou-frou froufrous furfurous ouroboros ouroborus roof-boss sous-sous susurrous

bobbobbobs frou-frous soussoubro

ouroroboros

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