b-u bbb bbc bbk bbn bbu bcb bcc bck bcn bcu bkb bkc bkk bkn bnb bnc bnk bnn bnu bub buc buk bun buu c-- cbb cbc cbk cbn cbu ccb ccc cck ccn ccu ckb ckc cn- cnb cnc cnn cnu cub cuc cuk cun cuu kbb kbc kbk kbn kbu kcb kcc kck kcn kcu kkb kkc kkk kkn kku kn- knc knk knn knu kub kuc kuk kun kuu nbb nbc nbk nbn nbu ncb ncc nck ncn ncu nkc nkk nkn nku nnb nnc nnk nnn nnu nub nuc nuk nun nuu ubb ubc ubk ubn ubu ucb ucc uck ucn ucu ukb ukc ukk ukn uku un- unb unc unk unn unu uuc uun uuu