bbbb bbbs bblb bbls bibb bibi bibl bibs biis bili bill bils birb biri birl birr birs bis- bisl biss blir blis blls blss bril bris brls brrr brrs brsb brsr ibis ibri ibss iiii iiis iirs iisi iisr ilir ilis ill- illi ills iri- iril iris irlb irri irrs isbl isil isis isls isri issi issr isss lblr lbrs libr libs liii liir liis lilb lili lill lils liri lirl lirr lirs lisi liss llbs llll lrrr ls-r lssr rbbb rbbr rbbs rbis rbsl rbss rib- ribs riis rill riri rirs risi riss rlls rrrr rsbi rsis rssl s-ib s-ii sbbs sbsi sibi sibs sil- sili sill sils siri sirr sirs sisi siss sl-i slib slir slrs srib sris ssbr ssis ssri ssrl ssrs sssb sssi ssss