bbbb bbbs bbin bblb bbls bibb bibi bibl bibs biin biis bili bill bils bin- bini binn bins birb biri birl birn birr birs bis- bisl biss blin blir blis blls blni blss bnib bnin bnrr bnss bril brin bris brls brns brrr brrs brsb brsr bsin bsns ibis ibns ibri ibsn ibss iiii iiis iirs iisi iisr ilin ilir ilis ill- illi ills ilni inis inni innr inns inri inrs inss iri- iril irin iris irlb irri irrs isbl isbn isil isin isis isls isri issi issr isss lblr lbrs libr libs liii liin liir liis lilb lili lill lils linn lins liri lirl lirn lirr lirs lisi liss llbs llll lrrr ls-r lssr n-ii nibi nibs niir nili nill nils nini ninl nins nirs nisi nisl niss nlls nlrb nnls nnnn nnsl nnss nrlb nrrl nsin nsis nslr nsls nsnr nsrl nssb nssr nsss rbbb rbbr rbbs rbis rbsl rbss rib- ribs riin riis rill rinn riri rirs risi riss rlin rlls rnbr rnin rnli rrrr rsbi rsis rsnn rsnr rssl s-ib s-ii sbbs sbsi sibi sibs sil- sili sill sils sini sinn sins siri sirr sirs sisi siss sl-i slib slir slln slrn slrs snib snir snns snrs srib sris srni srnn ssbn ssbr ssin ssis ssns ssri ssrl ssrs sssb sssi ssss