bbbb bbbq bbin bibb bibi biin bin- bini binn bint binu biqi bitt bitu bnib bnin bttb bubb bubi bubq 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 nqit ntnu ntui nubi nuin nuit nunn nunt nutt nutu qbit qqqq qttn qubi quib quin quit qunb quni qunu qutb quu- 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 uniq unit unni untb unut utin utti uttu utuq uuni uuuu