-ism bbbb bbbs bibb bibi bibs biis bims birb biri birr birs birt biru bis- biss bist bisu bits bitt bitu bmir bmmi bmts bmus brim bris brit brrm brrr brrs brsb brsr brst brum brus brut bsim bsms bsmt bsrm bssm bsts btrt btss bttb btus bubb bubi bubs bubu buir buis buit buiu bum- bumb bums bur- burb buri burm burr burs burt buru busi buss bust busu but- buti buts butt buus ibbm ibim ibis ibms ibri ibss ibtb ibts ibus iiii iiis iiit iirs iisi iism iisr iist iisu iitm iitr iitt iium imbi imir imit immi imms immt imri imrr imsi imsr imss imst imsu imts imus irbm iri- iris irms irri irrs irti irts irus isbt isim isis isit ismi isms isri issi issr isss issu isti istr ists isum isus itbs itim itis itms itri itrs itsi itsu itum itur iuiu iums iuss iust mbbs mbim mbis mbms mbrs mbus mibs miii miis miit mim- mimi mims miri mirr mirs mirt miru mis- misi misr miss mist misu mit- mitb miti mitm mits mitt mitu miui mmii mmis mmmm mmms mmst mmsu mmts mmus mrbb mrbm mrbs mris mrsi mrtm mrts mrtt msmb msmm msms msmu msrb msrt mssi mssm mssr msst mstr msts msus mtbs mtrr mtss mtst mttr mtts mubi mubs muir muis muit mumm mums mumu muri murr murs murt muru musi muss must musu muti muts mutt mutu muut rbbb rbbr rbbs rbis rbms rbss rbst rib- ribs ribu riis rimi rimm rims rimu riri rirs risi rism riss rist risu riti rits ritt ritu rius rmbs rmst rmtu rrrr rrum rsbi rsis rsts rstu rsum rtmi rtms rtss rtts rubb rubi rubs rubu ruis ruit rumb rumi rumm rums rumt ruri rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ib s-ii sbbs sbsi sbst sbus sibi sibs sibu siim siit simi simm sims simt siri sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sium sius siut smis smit smrt smss smti smtu smur smus smut srib srim sris srtr srub ssbr ssis ssit ssri ssrm ssrs sssb sssi sssm ssss sstb ssts stbs stib stim stir stis stit stms stmt stri strs stru stsi stsm stss sttr stub stum stur stus stut sub- subb subi subm subs suir suis suit sum- sumi sums sumu sur- suri surr surs surt suru sus- susi suss sust susu suti sutu suum suus tbbs tbit tbrb tbst tibi tibs tibu tiit tiiu timi timm tims timu tirb tiri tirr tirs tiru tisb tisi tism tiss tist titi tits titt titu tium tmbr tmsi tmtt tri- trib trim tris trit trmb trmi trms trmu trsi trst trtr trub trus trut truu tsis tssi tssm tssr tsst tstm tsts tsui tsum ttbb ttim ttms ttss tttt tubb tubr tubs tubu tuim tuis tuit tuiu tumb tumi tums tumu turb turi turm turr turs turt turu tusi tusm tuss tust tuti tuts tutt tutu tuum ubbi ubii ubir ubis ubit uims uirr uist uits umb- umbi umit umms umri umsu umts umus umut urbi urbs urib urim uris uriu urmi urri ursi urss ursu urts urum urur urus urut usbr usbs usim usis usmm usms ussb ussr usss usst ussu ustb usti ustm usts usui usus utis utmb utri utti uttu uuri uusi uuuu