bbbb bbin bibb bibi biin bin- bini binn bint binu birb biri birn birr birt biru bitt bitu bnib bnin bnrr brin brit brrr brun brut btrt bttb bubb bubi bubu buin buir buit buiu bunb buni bunn bunt bunu bur- burb buri burn burr burt buru but- buti butt ibri ibtb iiii iiit iitr iitt init inni innr innu inri inti intn intr intu inui inun iri- irin irri irti irun itin itri itur iuiu n-ii nbti nibi niir niit niiu nini nirt niru nitb niti nitr niur nnit nnnn nntn ntnu ntru nttr ntui nubi nuin nuit nunn nunt nuri nurn nurr nurt nuru nutt nutu rbbb rbbr rib- ribu riin rinn riri riti ritt ritu rnbr rnin rnnt rnut rrrr rrun rubb rubi rubu ruin ruit runi runn runt ruri ruru ruti rutt rutu ruun tbit tbrb tibi tibu tiit tiiu tini tinn tint tinu tirb tiri tirr tiru titi titt titu tnut tri- trib trin trit trtr trub trun trut truu ttbb tttt tubb tubr tubu tuin tuit tuiu tunb tuni tunn tunu turb turi turn turr turt turu tuti tutt tutu ubbi ubii ubir ubit uint uirr uni- unii unin unir unit unni untb unut urbi urib urin uriu urni urri urun urur urut utin utri utti uttu uuni uuri uuuu