bbbb bbbs bblb bbls bbpr bibb bibi bibl bibs biis bili bill bils bilt bilu bipp bips bipu birb biri birl birr birs birt biru bis- bisl bisp biss bist bisu bits bitt bitu blbt blip blir blis blit blls blsp blss blst blts blub blup blur blus blut bpsu bpti bril bris brit brlp brls brrr brrs brsb brsr brst brup brus brut bspp bspr bsts bsup btbp btlp btps btrt btss bttb btus bubb bubi bubs bubu buir buis buit buiu bulb buli bull buls bult bulu bups bur- burb buri burl burp burr burs burt buru busi buss bust busu but- buti buts butt buus ibis ibri ibss ibtb ibtl ibts ibus iiii iiis iiit iirs iisi iisp iisr iist iisu iitr iitt ilir ilis ilit ill- illi illp ills illt ilpr ilts ilus ilut ipil ippr ipri ipsi ipsp ipss ipts ipur ipus iput irbp iri- iril irip iris irlb irps irri irrs irsp irti irtp irts irul irus isbl isbt isil isis isit isls ispr isps isri isrp issi issp issr isss issu isti istp istr ists isup isus itbs itil itis itll itri itrs itsi itsp itsu itup itur iuiu iupp iuss iust lblr lbrs lbrt libr libs libu liii liir liis lilb lili lill lils lilt lilu lip- lipb lipi lipl lipp lips lipu liri lirl lirp lirr lirs lirt liru lisi lisp liss list lisu litb liti litl litr lits litt litu lius liut llbs llll llps lppl lprp lpss lptb lrps lrpu lrrr lrst lrts ls-r lsbu lspl lspr lssp lssr lsts ltbl ltib ltps ltrs ltsi ltsp ltsr lttr lubs luis luit luli lull lulu lupi lupu luri lurs lurt lusi luss lust luti luts luup pbil pblu pbrs pbsp pibb pibi piip pil- pili pill pils pilt pilu pipi pipp pips piri pirl pirr pirs piru pisi piss pist pisu piti pitr pits pitt pitu pius plbr plib plip plis plit plpp plri plsi plss pltt plup plur plus ppib ppli pppp ppps ppru ppss ppts pptt ppur prbs pri- prii pris prlr prls prps prri prrs prsi prsl prss prti prtp prtr prus prut pruu psbr psbt psil psip psis pspi pspp pspr psps psrp psst psts pstu ptbl ptui publ pubs pubu puir puis puit puiu puli pull pulp puls pult pulu pupi pupl pups pupu pur- purb puri purl purp purr purs puru pusi puss pust put- puti puts putt putu rbbb rbbr rbbs rbis rbsl rbsp rbss rbst rib- ribs ribu riis rill rilp rilu ripi ripl ripp ripr rips ript riri rirs risi risp riss rist risu riti ritl rits ritt ritu rius rlls rpii rpls rpps rpts rrrr rrsp rsbi rsis rslp rspb rsps rssl rstp rsts rstu rtls rtlt rtps rtss rttp rtts rubb rubi rubp rubs rubu ruis ruit rull rupp rupt ruri rurp rurs ruru rusi russ rust rusu ruti rutl ruts rutt rutu s-ib s-ii sbbs sbsi sbsp sbst sbus sibi sibs sibu siit sil- sili sill sils silt silu sipi sipp sips sipt siri sirp sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sius siut sl-i slbp slib slip slir slit sllp slpi slpp slps slrp slrs slst slsu slts slub slup slur slut spib spip spir spis spit splp splr spls spps spri sprs spsp spss spst sptb sptr spts spui spur spus sput srib sris srps srpt srsp srtp srtr srub ssbr ssis ssit sslp sslt sspl ssps sspt ssri ssrl ssrs sssb sssi ssss sstb sstl sstp ssts stbs stib stil stip stir stis stit stlt stpp stps stri strs stru stsi stss sttr stub stul stup stur stus stut sub- subb subi subl subs suir suis suit sul- suli sull sulp sult sulu sup- supp supr sups supt sur- suri surp surr surs surt suru sus- susi susp suss sust susu suti sutu suus tbbs tbil tbit tbrb tbsp tbst tbtp tibi tibs tibu tiit tiiu till tilr tils tilt tip- tipi tipp tips tipt tipu tirb tiri tirl tirr tirs tiru tisb tisi tiss tist titi titp tits titt titu tlli tlrs tpir tpls tppp tppr tprs tptp tptr tput tri- trib tril trip tris trit trpp trps trsi trst trtr trub trus trut truu tsis tsps tspt tssi tssr tsst tsts tsui tsup ttbb ttss tttt ttul tubb tubr tubs tubu tuil tuis tuit tuiu tuli tull tulp tulu tupi tups tupu turb turi turp turr turs turt turu tusi tuss tust tuti tutl tuts tutt tutu u-rp ubbi ubii ubir ubis ubit ubli ubls uipi uirr uist uits ulli ullr ulti ults ultt ulul ulus upis uplb uppp uppu upri upsi uptl upup urbi urbs urib uris uriu urls urri ursi urss ursu urts urup urur urus urut usbl usbr usbs usip usis uslp uslu uspp usps ussb ussr usss usst ussu ustb usti ustp usts usui usul usus util utis utri utsl utti uttu uulu uuri uusi uuuu