bbbb bbin bibb bibi biin bin- bini binn bint binu bitt bitu bnib bnin bttb bubb bubi bubu buin buit buiu bunb buni bunn bunt bunu but- buti butt ibtb iiii iiit iitt init inni innu inti intn intu inui inun itin iuiu n-ii nbti nibi niit niiu nini nitb niti nnit nnnn nntn ntnu ntui nubi nuin nuit nunn nunt nutt nutu tbit tibi tibu tiit tiiu tini tinn tint tinu titi titt titu tnut ttbb tttt tubb tubu tuin tuit tuiu tunb tuni tunn tunu tuti tutt tutu ubbi ubii ubit uint uni- unii unin unit unni untb unut utin utti uttu uuni uuuu