b-u bbb bbi bbr bbs bbt bbu bby bi- bib bii bir bis bit biu biy brb bri brr brs brt bru bry bsb bsi bsr bss bst bsu bsy btb bti btr bts btt btu bty bub bui bur bus but buu buy by- byi byr bys byt byu ibb ibi ibr ibs ibt ibu iby iib iii iir iis iit iiu ir- irb iri irr irs irt iru iry is- isb isi isr iss ist isu isy itb iti its itt itu ity iu- iub iui iur ius iut iyr iys iyt iyy rbb rbi rbr rbs rbt rbu rib rii rir ris rit riy rrb rri rrr rrs rrt rru rsb rsi rsr rss rst rsu rtb rti rtr rts rtt rtu rty rub rui rur rus rut ruu ruy ry- ryr rys ryu ryy sbb sbi sbr sbs sbt sbu sby sib sii sir sis sit siu sr- srb sri srr srs srt sry ss- ssb ssi ssr sss sst ssu stb sti str sts stt stu sty sub sui sur sus sut suu suy sy- syb syi syr sys syt syu tbb tbi tbr tbs tbt tbu tib tii tir tis tit tiu tiy trb tri trr trs trt tru try tsb tsi tsr tss tst tsu tsy ttb tti ttr tts ttt ttu tty tub tui tur tus tut tuu tuy tyr tys tyt ubb ubi ubr ubs ubt ubu uby uib uii uir uis uit uiu ur- urb uri urr urs urt uru ury usb usi usr uss ust usu utb uti utr uts utt utu uty uur uus uut uuu uyi uys uyu ybi ybr ybs yby yii yir yis yit yrs yrt yru ysb ysi ysr yss yst ysu ysy ytr yts ytt ytu yui yur yus yut yuu yuy yyb yys yyt yyu yyy

bbbb bbbs bibb bibi bibs biis birb biri birr birs birt biru biry bis- biss bist bisu bisy bits bitt bitu biys bris brit brrr brrs brsb brsr brst brus brut bry- bsts btrt btry btss bttb btus bubb bubi bubs bubu buir buis buit buiu bur- burb buri burr burs burt buru bury busi buss bust busu busy but- buti buts butt buty buus buyi buys buyu byit byrt bysb bysi byss byst bysy byts i-by ibis ibri ibss ibtb ibts ibus ibuy ibyi iiii iiis iiit iirs iisi iisr iist iisu iitr iitt irby iri- iris iriy irri irrs irti irts irus isbt isis isit isri issi issr isss issu issy isti istr ists isty isus isys itbs itby itis itri itrs itry itsi itsu itsy itty itur iuiu iuss iust iuty rbbb rbbr rbbs rbis rbss rbst rib- ribs ribu riby riis riri rirs risi riss rist risu riti rits ritt ritu rius rrrr rsbi rsis rsts rstu rtss rtts rubb rubi rubs rubu ruby ruis ruit ruri rurs ruru rusi russ rust rusu rusy ruti ruts rutt rutu ruty ruyi ruys ryis rysy rytt ryyt s-ib s-ii sbbs sbsi sbst sbus sibi sibs sibu siby siit siri sirr sirs sirt siru sisi siss sist sisu sisy sit- siti sits sitt situ sity siui sius siut siyi siyu srby srib sris srtr srub ssbr ssby ssis ssit ssri ssrs sssb sssi ssss sstb ssts stbs stib stir stis stit stri strs stru stry stsi stss sttr stub stur stus stut stuy styr stys sub- subb subi subs suir suis suit sur- suri surr surs surt suru sury sus- susi suss sust susu susy suti sutu suty suus suyi suyr suyu syis syrs syrt syry syss syst sytt tbbs tbit tbrb tbst tibi tibs tibu tiit tiiu tirb tiri tirr tirs tiru tiry tisb tisi tiss tist titi tits titt titu tiyi tri- trib tris trit trsi trst trtr trub trus trut truu try- tryb trys tsis tssi tssr tsst tsts tsui tsys ttbb ttss tttt ttys tubb tubr tubs tubu tuis tuit tuiu turb turi turr turs turt turu tury tusi tuss tust tuti tuts tutt tutu tuty tuys tybi tyir tyr- tyrr tyss tyst tyti tytt tyty tyus ubbi ubii ubir ubis ubit uirr uist uits urbi urbs urib uris uriu urri urry ursi urss ursu ursy urts urur urus urut usbr usbs usis ussb ussr usss usst ussu ussy ustb usti usts usui usus utby utis utri utti uttu uuri uusi uuuu uyir uyts ybbs ybry yirb yirr yiss yist yiti ysby ysii yssu ysyb yubu yuit yuri yurt yury yust yutu yuty yuyu yyyy

-itis bbuss bibbs bibby bibis bibri bibus birrs birst birsy birts birur biryu bisby bissy bitis bitit bitru bitry bitsy bitti bitts bitty brisb brisi briss brist brits britt brrrr bruis bruit bruiu bruri bruss brust brusy bruty bruys brys- bryt- btr-t btstu bubby bubry bubsy buist buisy burbs burri burrs burru burry burst burts burtt burus burut buryt busby busir bussu bussy busti busts busty busur busut busuu butis butit butts butty butut butyr buyit buysy by-by bybib bybus byrst byssi bytr- ibbur ibity iiiii iiris iisir iisys iitti irbis irbit iris- iriss irisu irrit irssi is-is isbut isisi isiti isits isitt isrib issru issus issuu istry istus isuus isyss itbit itisi itsit itsus ittti itu-r itu-t ituri ituru itutu iyiyi rbity ribbi ribby ribsy riisu risby risti risus risut ritsu ritts ritus rsust rubbi rubby rubis rubus rubys ruiru russi russy rusts rustu rusty rutty ruutu rybi rytis ryuir ryyty s-bus s-iii sibir sibiu sibsu sibur sibut siirt siris siriu sirsi sirsy sirur sisis sissi sissu sissy sists sitby sitit sitsi sitti situs siuri siuru siusi siutu siuyu sruby sruti sssrb sssss stib- stibb stiir stirs stirt stitt strib strit strrs strub strui strut struy stryi stu-i stubs stuir sturb sturt stuss subbu subby subis subss subst suibu suist suits suity surir suris surry sursy surti surtr surty surui surur surus sussy susus sutri suttu sutty syrts syrus systs syuri tbtbt tbutt ti-ti tibbi tibbs tibbu tibur tiris tirit tirrs tirru tirur tisis tisri tiss- tissi tissu tissy tisur titii titis titti titty titus