-ism bbbb bbbs bibb bibi bibs biis bims bimx birb biri birr birs biru birx bis- biss bisu bixi bmir bmmi bmus brim bris brix brrm brrr brrs brsb brsr brum brus brux bsim bsix bsms bsrm bssm bubb bubi bubs bubu buir buis buiu buix bum- bumb bums bur- burb buri burm burr burs buru busi buss busu busx buus ibbm ibim ibis ibms ibmx ibri ibss ibus iiii iiis iirs iisi iism iisr iisu iium imbi imir imix immi imms imri imrr imsi imsr imss imsu imsx imus irbm iri- iris irix irms irri irrs irus isbx isim isis ismi isms isri issi issr isss issu isum isus iuiu iums iuss ixxi mbbs mbim mbis mbms mbrs mbus mibs miii miis mim- mimi mims miri mirr mirs miru mis- misi misr miss misu miui mixi mixx mmii mmis mmix mmmm mmms mmsu mmus mmxi mmxx 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 muxi muxu mxii mxim mxxi rbbb rbbr rbbs rbis rbms rbmx rbss rib- ribs ribu riis rimi rimm rims rimu riri rirs risi rism riss risu rius rmbs rrrr rrum rsbi rsis rsmx 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 sixx 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 sux- ubbi ubii ubir ubis uims uimx uirr umb- umbi umms umri umsu umus urbi urbs urib urim uris uriu urix urmi urri ursi urss ursu urum urur urus usbr usbs usim usis usix usmm usms ussb ussr usss ussu usui usus uuri uusi uuuu uxus xibu xiii xisi xixi xmii xmms xuri xurs xuxu xxii xxix xxxi xxxx