b-u bbb bbo bbr bbs bbu bob boo bor bos bou bov brb bro brr brs bru brv bsb bso bsr bss bsu bsv bub buo bur bus buu bvb bvo bvr bvs bvu bvv ob- obb obo obr obs obu obv oo- oob ooo oor oos oov or- orb oro orr ors oru orv os- osb oso osr oss osu osv ou- ouo our ous ov- ovb ovo ovs ovv rbb rbo rbr rbs rbu rob roo ror ros rou rov rrb rrr rrs rru rsb rso rsr rss rsu rsv rub ruo rur rus ruu ruv rvb rvo rvr rvs rvu rvv sbb sbo sbr sbs sbu sbv sob soo sor sos sou sov sr- srb sro srr srs srv ss- ssb sso ssr sss ssu ssv sub suo sur sus suu suv svb svo svr svs svu svv ubb ubo ubr ubs ubu ubv uob uoo uor uos ur- urb uro urr urs uru usb uso usr uss usu usv uur uus uuu uvb uvo uvs uvu uvv vbo vbr vbs vbv vob voo vor vos vou vov vrb vrr vrs vru vsb vso vsr vss vsu vsv vur vus vuv vvb vvo vvr vvs vvv

-ous bbbb bbbs bobb bobo bobs bobu boob boor boos bor- boro borr bors boru boso boss bosu bour bous bovo brob broo bror bros brou brrr brrs brsb brsr brus bruv bsos bubb bubo bubs bubu bur- burb buro burr burs buru buss busu buus obbo obor obos obro obsr obss obus obvs oooo ooos oous orbb orbo orbs orbu oro- oror oros orro orrs orso orsu orub orus orvr orvs osoo osor osos osov osro ossb osso ossu oubs our- ouro ours ouu- ovo- ovoo rbbb rbbr rbbs rbss rob- robb robo robs robu roob roor roos roro roru roso ross roub rous rovo rovs rrrr rsos rubb rubs rubu ruro rurs ruru ruso russ rusu ruvu s-os sbbs sbor sbus sobo sobr sobs sobu soor soos sorb soro sorr sors soru soso soss sosv sour sous sovo sovs sovu sros srub ssbr ssrs sssb ssss sub- subb subo subs suor suos sur- suro surr surs suru surv sus- suso suss susu suus suvs svor ubbo ubos uor- uovo urbs uro- uroo urso urss ursu urur urus usbr usbs usos usov ussb ussr usss ussu usus uuuu uv-b uvvu voor vor- voro vors voru voso voss vosu vour vous vurb vvob vvsb vvvv

bbuss bo-bo bobos bobov bobr boobs boors booru borbo boro- boroo boros borou borov borro borsu borus borvo bosor bosso bours brobo brobs broos bross brous brrrr bruss bruvs bsous burbs buroo buros burov burro burrs burru burus busso bussu busur busuu o-r-b oboro obrov ooooo oovoo orbus orobo oroso orosu oruro ososo ossos ossur osusu ouoro ovoos ro-ro robbo robbs robo- robor robur rorbu rosso rosss rosu rubor rubus rusor rusov russo s-bus s-o-r so-so sobor sooru sorbo sorbs soror soros sorso sorsu sorus soss- sosus sours sous- sssrb sssss subbu subos subss surbo surov surur surus susso susus ubobo urbos uroob uros urour urous ursus urubu usour usovo uuuuu uvrou v-bob v-bor voobu vooru voous vovos vrbov

bbbbbb bobbos bobovo bobrov booboo boorus borbor bororo borovo borsov bososo bossou boubou bourou bousov bousso boussu brosso brubru brusor bububu burbur burovo burros obsorb oooooo orobus orrour ossous ououso ousrou robous robovo rubro- rusovo russo- russus sobos soosoo sorbus sorors sorous sorrus sorsor sourou sousou srbovo suburb suroso susurr ubussu urobos urusov voros vrbovo vvvvvv

bbbbbbb bobross boo-boo booboos borusov boubous bourrou brosour brusovo burruss bus-obo obrosov oroboro robosub rubbour sou-sou soursob sssssss suburbs suursoo suvorov ububboo usurous

bbbbbbbb bo-bo-bo bobobobs bourrous broubrou buruburu obrosovo oroborus sussurus susurrus suvorovo svosov ubbubboo uroboros vorovoro

borborbor ouroboros ouroborus sous-sous susurrous

bobbobbobs soussoubro vourvourou

ouroroboros

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