b-u bbb bbk bbn bbo bbt bbu bkb bkk bkn bko bkt bnb bnk bnn bno bnt bnu bob bok bon boo bot bou btb btk btn bto btt btu bub buk bun buo but buu k-t kbb kbk kbn kbo kbu kkb kkk kkn kkt kku kn- knk knn kno knt knu kob kok kon koo kot kou ktb ktk ktn kto ktt ktu kub kuk kun kut kuu nbb nbk nbn nbo nbt nbu nkk nkn nko nkt nku nnb nnk nnn nno nnt nnu no- nob nok non noo not nou ntb ntk ntn nto ntt ntu nub nuk nun nuo nut nuu ob- obb obk obn obo obt obu okb okk oko oku on- onb onk onn ono ont onu oo- oob ook oon ooo oot ot- otb otk otn oto ott otu ou- ouk oun ouo out tbb tbk tbn tbo tbt tbu tkb tkk tko tkt tnb tnk tnn tno tnt to- tob tok ton too tot tou ttb ttk ttn tto ttt ttu tub tuk tun tuo tut tuu ubb ubk ubn ubo ubt ubu ukb ukk ukn uku un- unb unk unn uno unt unu uob uok uon uoo uot utb utk utn uto utt utu uun uut uuu