bbbb bbin bibb bibi biin bin- bini binn binu birb biri birn birr biru bnib bnin bnrr brin brrr brun bubb bubi bubu buin buir buiu bunb buni bunn bunu bur- burb buri burn burr buru ibri iiii inni innr innu inri inui inun iri- irin irri irun iuiu n-ii nibi niir niiu nini niru niur nnnn nubi nuin nunn nuri nurn nurr nuru rbbb rbbr rib- ribu riin rinn riri rnbr rnin rrrr rrun rubb rubi rubu ruin runi runn ruri ruru ruun ubbi ubii ubir uirr uni- unii unin unir unni urbi urib urin uriu urni urri urun urur uuni uuri uuuu