-up b-p b-u bbb bbi bbp bbr bbs bbt bbu bi- bib bii bip bir bis bit biu bpb bpi bpp bpr bps bpt bpu brb bri brp brr brs brt bru bsb bsi bsp bsr bss bst bsu btb bti btp btr bts btt btu bub bui bup bur bus but buu ibb ibi ibp ibr ibs ibt ibu iib iii iip iir iis iit iiu ipb ipi ipp ipr ips ipt ipu ir- irb iri irp irr irs irt iru is- isb isi isp isr iss ist isu itb iti itp its itt itu iu- iub iui iup iur ius iut p-p pbb pbi pbp pbr pbs pbt pbu pib pii pip pir pis pit piu ppb ppi ppp ppr pps ppt ppu prb pri prp prr prs prt pru ps- psb psi psp psr pss pst psu pt- ptb pti ptp ptr pts ptt ptu pub pui pup pur pus put puu rbb rbi rbp rbr rbs rbt rbu rib rii rip rir ris rit rpb rpi rpp rpr rps rpt rpu rrb rri rrp rrr rrs rrt rru rsb rsi rsp rsr rss rst rsu rtb rti rtp rtr rts rtt rtu rub rui rup rur rus rut ruu sbb sbi sbp sbr sbs sbt sbu sib sii sip sir sis sit siu spb spi spp spr sps spt spu sr- srb sri srp srr srs srt ss- ssb ssi ssp ssr sss sst ssu stb sti stp str sts stt stu sub sui sup sur sus sut suu tbb tbi tbp tbr tbs tbt tbu tib tii tip tir tis tit tiu tpb tpi tpp tpr tps tpt tpu trb tri trp trr trs trt tru tsb tsi tsp tsr tss tst tsu ttb tti ttp ttr tts ttt ttu tub tui tup tur tus tut tuu ubb ubi ubp ubr ubs ubt ubu uib uii uip uir uis uit uiu up- upb upi upp upr ups upt upu ur- urb uri urp urr urs urt uru usb usi usp usr uss ust usu utb uti utp utr uts utt utu uur uus uut uuu

bbbb bbbs bbpr bibb bibi bibs biis bipp bips bipu birb biri birr birs birt biru bis- bisp biss bist bisu bits bitt bitu bpsu bpti bris brit brrr brrs brsb brsr brst brup brus brut bspp bspr bsts bsup btbp btps btrt btss bttb btus bubb bubi bubs bubu buir buis buit buiu bups bur- burb buri burp burr burs burt buru busi buss bust busu but- buti buts butt buus ibis ibri ibss ibtb ibts ibus iiii iiis iiit iirs iisi iisp iisr iist iisu iitr iitt ippr ipri ipsi ipsp ipss ipts ipur ipus iput irbp iri- irip iris irps irri irrs irsp irti irtp irts irus isbt isis isit ispr isps isri isrp issi issp issr isss issu isti istp istr ists isup isus itbs itis itri itrs itsi itsp itsu itup itur iuiu iupp iuss iust pbrs pbsp pibb pibi piip pipi pipp pips piri pirr pirs piru pisi piss pist pisu piti pitr pits pitt pitu pius ppib pppp ppps ppru ppss ppts pptt ppur prbs pri- prii pris prps prri prrs prsi prss prti prtp prtr prus prut pruu psbr psbt psip psis pspi pspp pspr psps psrp psst psts pstu ptui pubs pubu puir puis puit puiu pupi pups pupu pur- purb puri purp purr purs puru pusi puss pust put- puti puts putt putu rbbb rbbr rbbs rbis rbsp rbss rbst rib- ribs ribu riis ripi ripp ripr rips ript riri rirs risi risp riss rist risu riti rits ritt ritu rius rpii rpps rpts rrrr rrsp rsbi rsis rspb rsps rstp rsts rstu rtps rtss rttp rtts rubb rubi rubp rubs rubu ruis ruit rupp rupt ruri rurp rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ib s-ii sbbs sbsi sbsp sbst sbus sibi sibs sibu siit sipi sipp sips sipt siri sirp sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sius siut spib spip spir spis spit spps spri sprs spsp spss spst sptb sptr spts spui spur spus sput srib sris srps srpt srsp srtp srtr srub ssbr ssis ssit ssps sspt ssri ssrs sssb sssi ssss sstb sstp ssts stbs stib stip stir stis stit stpp stps stri strs stru stsi stss sttr stub stup stur stus stut sub- subb subi subs suir suis suit sup- supp supr sups supt sur- suri surp surr surs surt suru sus- susi susp suss sust susu suti sutu suus tbbs tbit tbrb tbsp tbst tbtp tibi tibs tibu tiit tiiu tip- tipi tipp tips tipt tipu tirb tiri tirr tirs tiru tisb tisi tiss tist titi titp tits titt titu tpir tppp tppr tprs tptp tptr tput tri- trib trip tris trit trpp trps trsi trst trtr trub trus trut truu tsis tsps tspt tssi tssr tsst tsts tsui tsup ttbb ttss tttt tubb tubr tubs tubu tuis tuit tuiu tupi tups tupu turb turi turp turr turs turt turu tusi tuss tust tuti tuts tutt tutu u-rp ubbi ubii ubir ubis ubit uipi uirr uist uits upis uppp uppu upri upsi upup urbi urbs urib uris uriu urri ursi urss ursu urts urup urur urus urut usbr usbs usip usis uspp usps ussb ussr usss usst ussu ustb usti ustp usts usui usus utis utri utti uttu uuri uusi uuuu

-itis bbuss bibbs bibis bibri bibus bipib birrs birst birts birur bitis bitit bitru bitti bitts bitup bpips brisb brisi briss brist brits britt brrrr bruis bruit bruiu bruri bruss brust btr-t btstu buist burbs burps burri burrs burru burst burts burtt burus burut busir bussu busti busts busur busut busuu butis butit butts butut ibbur iiiii iiris iisir iitti ipiti ipsi- ipsus ipubi irbis irbit iris- iriss irisu irrit irssi irupi is-is isbut isisi isiti isits isitt ispup isrib issru issus issuu istup istus isuus itbit itisi itrip itsit itsup itsus ittti itu-r itu-t ituri ituru itutu iupps iuput pbist