b-u bbb bbk bbn bbo bbt bbu bby bkb bkk bkn bko bkt bnb bnk bnn bno bnt bnu bob bok bon boo bot bou boy btb btk btn bto btt btu bty bub buk bun buo but buu buy by- byk byn byo byt byu k-t kbb kbk kbn kbo kbu kkb kkk kkn kkt kku kky kn- knk knn kno knt knu kob kok kon koo kot kou koy ktb ktk ktn kto ktt ktu kub kuk kun kut kuu kuy kyn kyo kyt kyu nbb nbk nbn nbo nbt nbu nkk nkn nko nkt nku nky nnb nnk nnn nno nnt nnu no- nob nok non noo not nou noy ntb ntk ntn nto ntt ntu nub nuk nun nuo nut nuu nuy nyk nyn nyo nyt nyu nyy ob- obb obk obn obo obt obu oby okb okk oko oku on- onb onk onn ono ont onu ony oo- oob ook oon ooo oot ot- otb otk otn oto ott otu ou- ouk oun ouo out oyo tbb tbk tbn tbo tbt tbu tkb tkk tko tkt tky tnb tnk tnn tno tnt to- tob tok ton too tot tou toy ttb ttk ttn tto ttt ttu tty tub tuk tun tuo tut tuu tuy tyn tyo tyt ubb ubk ubn ubo ubt ubu uby ukb ukk ukn uku un- unb unk unn uno unt unu uny uob uok uon uoo uot utb utk utn uto utt utu uty uun uut uuu uyo uyu yby ykk ykn ynk ynn ynu yny yob yok yon yoo yot you yoy ytk ytn yto ytt ytu yuk yun yuo yut yuu yuy yyb yyt yyu yyy