bbbb bbbs bbin bbpr bibb bibi bibs biin biis bin- bini binn bins binu bipp bips bipu birb biri birn birr birs biru bis- bisp biss bisu bnib bnin bnpp bnrr bnss bpsu brin bris brns brrr brrs brsb brsr brun brup brus bsin bsns bspp bspr bsup bubb bubi bubs bubu buin buir buis buiu bunb buni bunn buns bunu bups bur- burb buri burn burp burr burs buru busi buss busu buus ibis ibns ibri ibsn ibss ibus iiii iiis iirs iisi iisp iisr iisu inis inni innr inns innu inp- inpi inpp inri inrs insp inss insu inui inun inup inus ipin ippr ipri ipsi ipsp ipss ipur ipus irbp iri- irin irip iris irps irri irrs irsp irun irus isbn isin isis ispr isps isri isrp issi issp issr isss issu isup isus iuiu iupp iuss n-ii n-up nbpp nbps nbsp nibi nibs niip niir niiu nini nins nipr nips nirs niru nisi nisp niss nisu niur nnnn nnpi nnpr nnss npin npri npss nrpn nrps nrsp nsin nsis nsnr nspi nsps nssb nssp nssr nsss nsub nubi nubs nuin nunn nuns nups nuri nurn nurp nurr nurs nuru nusi nuss nusu pbrs pbsp pibb pibi piip pini pinn pinp pins pinu pipi pipp pips piri pirn pirr pirs piru pisi piss pisu pius pnin pnpp pnup ppib pppn pppp ppps ppru ppss ppur prbs pri- prii prin pris prnp prps prri prrs prsi prss prus pruu psbr psip psis psni psnr pspi pspp pspr psps psrp pubs pubu puin puir puis puiu puns punu pupi pups pupu pur- purb puri purp purr purs puru pusi puss rbbb rbbr rbbs rbis rbsp rbss rib- ribs ribu riin riis rinn ripi ripp ripr rips riri rirs risi risp riss risu rius rnbr rnin rnsp rpii rppn rpps rrrr rrsp rrun rsbi rsis rsnn rsnr rspb rsps rubb rubi rubp rubs rubu ruin ruis runi runn runs rupp ruri rurp rurs ruru rusi russ rusu ruun s-ib s-ii sbbs sbsi sbsp sbus sibi sibs sibu sini sinn sinp sins sinu sipi sipp sips siri sirp sirr sirs siru sisi siss sisu siui sius snib snip snir snns snpp snrs snub snur snus spib spin spip spir spis spns spps spri sprs spsp spss spui spun spur spus srib sris srni srnn srps srsp srub ssbn ssbr ssin ssis ssns ssps ssri ssrs sssb sssi ssss sub- subb subi subs suin suir suis sun- sunb suni sunn suns sunu sup- supp supr sups sur- suri surn surp surr surs suru sus- susi susp suss susu suus u-rp ubbi ubii ubir ubis uipi uirr uni- unii unin unir unis unni unns unps unrs uns- unus upin upis upnp uppp uppu upri upsi upup urbi urbs urib urin uris uriu urni urns urri ursi urss ursu urun urup urur urus usbr usbs usin usip usis usnr usnu uspp usps ussb ussr usss ussu usui usun usus uuni uuri uusi uuuu