-ism bbbb bbbs bibb bibi bibs biis bims birb biri birr birs biru bis- biss bisu bmir bmmi bmus brim bris brrm brrr brrs brsb brsr brum brus bsim bsms bsrm bssm bubb bubi bubs bubu buir buis buiu bum- bumb bums bur- burb buri burm burr burs buru busi buss busu buus ibbm ibim ibis ibms ibri ibss ibus iiii iiis iirs iisi iism iisr iisu iium imbi imir immi imms imri imrr imsi imsr imss imsu imus irbm iri- iris irms irri irrs irus isim isis ismi isms isri issi issr isss issu isum isus iuiu iums iuss mbbs mbim mbis mbms mbrs mbus mibs miii miis mim- mimi mims miri mirr mirs miru mis- misi misr miss misu miui mmii mmis mmmm mmms mmsu mmus mrbb mrbm mrbs mris mrsi msmb msmm msms msmu msrb mssi mssm mssr msus mubi mubs muir muis mumm mums mumu muri murr murs muru musi muss musu rbbb rbbr rbbs rbis rbms rbss rib- ribs ribu riis rimi rimm rims rimu riri rirs risi rism riss risu rius rmbs rrrr rrum rsbi rsis rsum rubb rubi rubs rubu ruis rumb rumi rumm rums ruri rurs ruru rusi russ rusu s-ib s-ii sbbs sbsi sbus sibi sibs sibu siim simi simm sims siri sirr sirs siru sisi siss sisu siui sium sius smis smss smur smus srib srim sris srub ssbr ssis ssri ssrm ssrs sssb sssi sssm ssss sub- subb subi subm subs suir suis sum- sumi sums sumu sur- suri surr surs suru sus- susi suss susu suum suus ubbi ubii ubir ubis uims uirr umb- umbi umms umri umsu umus urbi urbs urib urim uris uriu urmi urri ursi urss ursu urum urur urus usbr usbs usim usis usmm usms ussb ussr usss ussu usui usus uuri uusi uuuu