-ism bbbb bbbs bibb bibi bibs biis bims bimx birb biri birr birs birx bis- biss bixi bmir bmmi brim bris brix brrm brrr brrs brsb brsr bsim bsix bsms bsrm bssm ibbm ibim ibis ibms ibmx ibri ibss iiii iiis iirs iisi iism iisr imbi imir imix immi imms imri imrr imsi imsr imss imsx irbm iri- iris irix irms irri irrs isbx isim isis ismi isms isri issi issr isss ixxi mbbs mbim mbis mbms mbrs mibs miii miis mim- mimi mims miri mirr mirs mis- misi misr miss mixi mixx mmii mmis mmix mmmm mmms mmxi mmxx mrbb mrbm mrbs mris mrsi msmb msmm msms msrb mssi mssm mssr mxii mxim mxxi rbbb rbbr rbbs rbis rbms rbmx rbss rib- ribs riis rimi rimm rims riri rirs risi rism riss rmbs rrrr rsbi rsis rsmx s-ib s-ii sbbs sbsi sibi sibs siim simi simm sims siri sirr sirs sisi siss sixx smis smss srib srim sris ssbr ssis ssri ssrm ssrs sssb sssi sssm ssss xiii xisi xixi xmii xmms xxii xxix xxxi xxxx