bbbb bbbs bbin bbpr bibb bibi bibs biin biis bin- bini binn bins bint binu bipp bips bipu birb biri birn birr birs birt biru bis- bisp biss bist bisu bits bitt bitu bnib bnin bnpp bnrr bnss bpsu bpti brin bris brit brns brrr brrs brsb brsr brst brun brup brus brut bsin bsns bspp bspr bsts bsup btbp btps btrt btss bttb btus bubb bubi bubs bubu buin buir buis buit buiu bunb buni bunn buns bunt bunu bups bur- burb buri burn burp burr burs burt buru busi buss bust busu but- buti buts butt buus ibis ibns ibri ibsn ibss ibtb ibts ibus iiii iiis iiit iirs iisi iisp iisr iist iisu iitr iitt inis init inni innr inns innu inp- inpi inpp inpt inri inrs insp inss inst insu inti intn intp intr ints intu inui inun inup inus ipin ippr ipri ipsi ipsp ipss ipts ipur ipus iput irbp iri- irin irip iris irps irri irrs irsp irti irtp irts irun irus isbn isbt isin isis isit isnt ispr isps isri isrp issi issp issr isss issu isti istp istr ists isup isus itbs itin itis itri itrs itsi itsp itsu itup itur iuiu iupp iuss iust n-ii n-up nbpp nbps nbsp nbti nibi nibs niip niir niit niiu nini nins nipr nips nipt nirs nirt niru nisi nisp niss nist nisu nitb niti nitr nits niur nnit nnnn nnpi nnpr nnss nntn npin npri nprt npss nptn nrpn nrps nrsp nrts nsin nsis nsnr nspi nsps nssb nssp nssr nsss nstp nsts nstu nsub ntis ntnu ntru ntsb ntss ntsu nttr ntui nubi nubs nuin nuit nunn nuns nunt nups nuri nurn nurp nurr nurs nurt nuru nusi nuss nust nusu nuts nutt nutu pbrs pbsp pibb pibi piip pini pinn pinp pins pint pinu pipi pipp pips piri pirn pirr pirs piru pisi piss pist pisu piti pitr pits pitt pitu pius pnin pnpp pntr pnup ppib pppn pppp ppps ppru ppss pptn ppts pptt ppur prbs pri- prii prin pris prnp prps prri prrs prsi prss prti prtp prtr prus prut pruu psbr psbt psip psis psni psnr pspi pspp pspr psps psrp psst psts pstu ptui pubs pubu puin puir puis puit puiu puns punt punu 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 riin riis rinn ripi ripp ripr rips ript riri rirs risi risp riss rist risu riti rits ritt ritu rius rnbr rnin rnnt rnsp rntp rnut rpii rppn rpps rptn rpts rrrr rrsp rrun rsbi rsis rsnn rsnr rspb rsps rstp rsts rstu rtns rtps rtss rttp rtts rubb rubi rubp rubs rubu ruin ruis ruit runi runn runs runt rupp rupt ruri rurp rurs ruru rusi russ rust rusu ruti ruts rutt rutu ruun s-ib s-ii sbbs sbsi sbsp sbst sbtn sbus sibi sibs sibu siit sini sinn sinp sins sint sinu sipi sipp sips sipt siri sirp sirr sirs sirt siru sisi siss sist sisu sit- siti sitn sits sitt situ siui sius siut snib snip snir snit snns snpp snrs sntr snub snur snus spib spin spip spir spis spit spns spps spri sprs spsp spss spst sptb sptr spts spui spun spur spus sput srib sris srni srnn srps srpt srsp srtp srtr srub ssbn ssbr ssin ssis ssit ssns ssps sspt ssri ssrs sssb sssi ssss sstb sstp ssts stbs stib stip stir stis stit stnn stnr stns stpp stps stri strn strs stru stsi stss sttr stub stun stup stur stus stut sub- subb subi subs suin suir suis suit sun- sunb suni sunn suns sunt sunu sup- supp supr sups supt sur- suri surn 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 tini tinn tins tint tinu tip- tipi tipp tips tipt tipu tirb tiri tirr tirs tiru tisb tisi tiss tist titi titp tits titt titu tnsp tnts tnut tpir tppp tppr tprs tptp tptr tput tri- trib trin trip tris trit trpn trpp trps trsi trst trtr trub trun trus trut truu tsin tsis tspn tsps tspt tssi tssr tsst tsts tsui tsun tsup ttbb ttss tttt tubb tubr tubs tubu tuin tuis tuit tuiu tunb tuni tunn tuns tunu tupi tups tupu turb turi turn turp turr turs turt turu tusi tuss tust tuti tuts tutt tutu u-rp ubbi ubii ubir ubis ubit uint uipi uirr uist uits uni- unii unin unir unis unit unni unns unps unrs uns- unst untb unts unus unut upin upis upnp uppp uppu upri upsi upup urbi urbs urib urin uris uriu urni urns urri ursi urss ursu urts urun urup urur urus urut usbr usbs usin usip usis usnr usnu uspp usps ussb ussr usss usst ussu ustb usti ustp usts usui usun usus utin utis utri utti uttu uuni uuri uusi uuuu