bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins binz birb biri birn birr birs bis- biss bizz bnib bnin bnrr bnss brin bris briz brns brrr brrs brsb brsr bsin bsns bzzz ibis ibns ibri ibsn ibss iiii iiis iirs iisi iisr inis inni innr inns inri inrs inss iri- irin iris irri irrs isbn isin isis isri issi issr isss n-ii nibi nibs niir nini nins nirs nisi niss nnnn nnss nsin nsis nsnr nssb nssr nsss nzrb rbbb rbbr rbbs rbis rbss rib- ribs riin riis rinn riri rirs risi riss rizi rizz rnbr rnin rrrr rsbi rsis rsnn rsnr s-ib s-ii sbbs sbsi sibi sibs sini sinn sins siri sirr sirs sisi siss sizz snib snir snns snrs srib sris srni srnn ssbn ssbr ssin ssis ssns ssri ssrs sssb sssi ssss szin szis szss zinn zins ziri zisi zizi zizz zrin zsss zzzs zzzz