bbbb bbin bblb bibb bibi bibl biin bili bill bilu bin- bini binn binu birb biri birl birn birr biru blin blir blni blub blur bnib bnin bnrr bril brin brrr brun bubb bubi bubu buin buir buiu bulb buli bull bulu bunb buni bunn bunu bur- burb buri burl burn burr buru ibri iiii ilin ilir ill- illi ilni inni innr innu inri inui inul inun iri- iril irin irlb irri irul irun iuiu lblr libr libu liii liin liir lilb lili lill lilu linn liri lirl lirn lirr liru liun llll lrrr luin luli lull lulu luni lunn luri n-ii nibi niir niiu nili nill nilu nini ninl niru niur nlrb nnnn nrlb nrrl nubi nubl nuin nuli null nunn nuri nurl nurn nurr nuru rbbb rbbr rib- ribu riin rill rilu rinn riri rlin rnbr rnin rnli rrrr rrun rubb rubi rubu ruin rull runi runn ruri ruru ruun ubbi ubii ubir ubli uirr ulli ullr ulul uni- unii unin unir unni urbi urib urin uriu urni urri urun urur uulu uuni uuri uuuu