rofo roif roio roir rois roit roiu roob roof rooi roor roos root rori roro rort roru rosi roso ross rost roti roto rotr rots rott roub rouf rous rout rrif rrrr rsbi rsis rsos rsts rstu rtbf rtfb rtss rtts rubb rubi rubs rubu ruff rufo ruft ruif ruis ruit ruri ruro rurs ruru rusi ruso russ rust rusu ruti ruto ruts rutt rutu s-ib s-ii s-os sbbs sbor sbot sbsi sbst sbus sfio sfor sfos sfro sfss sfsu sfts sibi sibo sibs sibu siff sifo sifr sift sifu siit sior sios siot siou sirf siri siro sirr sirs sirt siru sisi siss sist sisu sit- siti sito sits sitt situ siui sius siut sobo sobr sobs sobt sobu sofi sofo soft soif soir sois soit soof soor soos soot sorb sori soro sorr sors sort soru sosi soso soss sost soto sots sotu souf sour sous sout srfi srib sris sros srtr srub ssbr ssis ssit ssot ssri ssrs sssb sssf sssi ssss sstb ssts stbs stfu stib stif stio stir stis stit stob stof stoo stor stos stot stou stri stro strs stru stsf stsi stss sttr stub stuf stur stus stut sub- subb subi subo subs suf- suff sufi sufr sufs sufu suio suir suis suit suor suos sur- surf suri suro surr surs surt suru sus- susi suso suss sust susu suti suto sutu suus tbbs tbit tbrb tbst tfot tfrs tfsi tfss tibi tibs tibu tiff tifo tift tiit tiiu tios tiou tirb tiri tiro tirr tirs tiru tisb tisi tiso tiss tist titi tito tits titt titu tobi tobo tobs tobt tobu toff tofi tofo toft tofu tois toit toof toor toos toot torf tori toro torr tors tort toru tosb tosi toso toss tost tosu toti toto totr tots tott toui tour tous tout trfr tri- trib trif trio tris trit troi troo tros trot trou trsi trst trtr trub trus trut truu tsis tsob tsoi tsos tsou tssf tssi tssr tsst tsts tsui ttbb ttff ttss tttt tubb tubo tubr tubs tubu tuff tufi tufo tuft tufu tuis tuit tuiu tuor tuos turb turf turi turo turr turs turt turu tusi tuss tust tuti tuto tuts tutt tutu tuuo ubbi ubbo ubii ubir ubis ubit ubos ubtf ufos uirr uist uits uofo uor- urbi urbs urff urfi urft urib urif uris uriu uro- uroo urri ursi urso urss ursu urts urur urus urut usbr usbs usfi usfs usif usis usoi usos ussb ussf ussr usss usst ussu ustb usti usto usts usui usus utfo utis utor utri utti utto uttu uuri uusi uutf uuuu

-itis bbuss bibbo bibbs bibio bibis bibos bibri bibus biffi biffo biffs bifor bifus bioss biros birou birrs birst birts birur bisfi bisou bisto bitis bitit bitof bitru bitti bitto bitts bo-bo bobbi bobos bobr bobri bobst bobts boffi boffo boffs boios boiro boist boito boobs boofs booit boors boort booru boost boots borbo borio boris boro- boroo boros borot borou borro borsi borst borsu borts borus borut bosio bosor bossi bosso bosut botis botos botou botro botti botts bottu botus bouri bours boust bouto bouts brifu briot briou brisb brisi briss brist brito brits britt brobo brobs broft broos bross broto brous brout brrrr bruff bruis bruit bruiu bruri bruss brust bsoft bsous btr-t btrfs btstu buffi buffo buffs bufos buist burbs burfi burio buroo buros burri burro burrs burru burst burts burtt burus burut busir busot busso bussu busti busto busts busur busut busuu butis butit buto- butor butot butou butts butuo butut fibis fibr- fibro fiori firit firos firou first fisbo fissi fisto fists fitit fitof fitor fitou fitri fitto fitts fofos foios foir- foist footi foots forbs forio forit foros forro forso forss forst forti forto forts forur forus fotos fotui fotur fotus fourb fouro fours foust fouts friis frios friso friss frist frito frits fritt frobs froit froot frost frots fruit frust fruto ftrtt fu-fu fubbs fubus fuffs furbo furio furir furo- furor furrs furst furus fusi- fusio fuso- fusor fusts fusus futsu futur i-bot ibbur ibibo ibros if-- iffou ifits ifius ifrit ifttt iiiii iiris iisir iitti iobit ioooi ioooo iorio iotit iotti irbis irbit irios iris- iriss irisu irobo irori irour irous irrit irssi is-is isbut isfit isfor isios isiro isisi isiti isits isitt isoff isoft isour isout isrib issor issou issru issus issuu istoo istus isuto isuus itbit itfit itfor itisi itiso itobi itoff itoss itour itout itsit itsof itsso itsto itsus ittoo ittti itu-r itu-t ituri ituro ituru itutu o-r-b obits oboro obosi obout obtus offir offis offit offof offto ofori ofosu ofoto ofour ofsit oirot oitti oobit ooioo ooooo ootus orbis orbit orbot orbus orfor oribi orist orito orits orius orobo orosi oroso orost orosu orout orris orsis orsit ortoo oruro orust orutu ososo ossi- ossis ossos ossur ostir ostis ostri ostro osubi osusu otisb otobi otori otoso ototo otour otros ottir ottis ottoi ottos ottur oubit oubut ouir- ouoro ousts outis outof outro outto outts ri-fi ribbi ribo- ribot riffs rifts riisu riots risso risti risto risus risut ritsu ritts ritus ro-ro robbi robbo robbs robo- robor robot robrt robur rofor roiot roist roofs rooft roosi roost roots rorbu rorts rosis rossi rosso rosss rosto rosts rosu rotis roto- rotor rotos rotot rotti rotto roubt roust routs routt rsssf rsust rubbi rubio rubis rubof rubor rubus ruffo ruffs rufi- rufio rufo- rufus ruiru ruoti rusio rusor rusot russi russo rusts rustu ruutu s-bot s-bus s-iii s-o-r sfouf sibir sibiu sibor sibos sibot sibsu sibur sibut siftr sifts sifus siirt siout sirio siris siriu siror siros sirsi sirur sisis sisor sissi sissu sisto sists sitio sitit sito- sitor sitou sitsi sitti situs siuri siuru siusi siutu so-so sobor sobri sofis softs soirs soori soort sooru soosi soots sorbo sorbs sorbt sorio soror soros sorso sorsu sorti sorts sortu sorus soss- sossi sosti sosto sosui sosus sotio sotoo sotos sotsu sotto sotts souff souri sours sous- souto sroof sroot sruti sssrb sssss stfis stib- stibb stibo stiff stift