bbbb bbin bblb bibb bibi bibl biin bili bill bilt bilu bin- bini binn bint binu birb biri birl birn birr birt biru bitt bitu blbt blin blir blit blni blub blur blut bnib bnin bnrr bril brin brit brrr brun brut btrt bttb bubb bubi bubu buin buir buit buiu bulb buli bull bult bulu bunb buni bunn bunt bunu bur- burb buri burl burn burr burt buru but- buti butt ibri ibtb ibtl iiii iiit iitr iitt ilin ilir ilit ill- illi illt ilni ilut init inni innr innu inri inti intl intn intr intu inui inul inun iri- iril irin irlb irri irti irul irun itil itin itll itri itur iuiu lblr lbrt libr libu liii liin liir lilb lili lill lilt lilu linn lint liri lirl lirn lirr lirt liru litb liti litl litr litt litu liun liut llll lrrr ltbl ltib ltnt lttr luin luit luli lull lulu luni lunn lunt luri lurt luti n-ii nbti nibi niir niit niiu nili nill nilt nilu nini ninl nirt niru nitb niti nitr niur nlrb nnit nnnn nntn nrlb nrrl nrtl ntnu ntrl ntru nttr ntui nubi nubl nuin nuit nuli null nunn nunt nuri nurl nurn nurr nurt nuru nutt nutu rbbb rbbr rib- ribu riin rill rilu rinn riri riti ritl ritt ritu rlin rnbr rnin rnli rnnt rnut rrrr rrun rtlt rubb rubi rubu ruin ruit rull runi runn runt ruri ruru ruti rutl rutt rutu ruun tbil tbit tbrb tibi tibu tiit tiiu till tiln tilr tilt tini tinn tint tinu tirb tiri tirl tirr tiru titi titt titu tlli tnut tri- trib tril trin trit trtr trub trun trut truu ttbb tttt ttul tubb tubr tubu tuil tuin tuit tuiu tuli tull tulu tunb tuni tunn tunu turb turi turn turr turt turu tuti tutl tutt tutu ubbi ubii ubir ubit ubli uint uirr ulli ullr ulti ultt ulul uni- unii unin unir unit unni untb unut urbi urib urin uriu urni urri urun urur urut util utin utri utti uttu uulu uuni uuri uuuu