b-u bbb bbk bbn bbs bbu bkb bkk bkn bks bnb bnk bnn bns bnu bsb bsk bsn bss bsu bub buk bun bus buu kbb kbk kbn kbs kbu kkb kkk kkn kks kku kn- knk knn knu ksb ksk ksn kss ksu kub kuk kun kus kuu nbb nbk nbn nbs nbu nkk nkn nks nku nnb nnk nnn nns nnu nsb nsk nsn nss nsu nub nuk nun nus nuu sbb sbk sbn sbs sbu sk- skb skk sks sku snb snk snn sns snu ss- ssb ssk ssn sss ssu sub suk sun sus suu ubb ubk ubn ubs ubu ukb ukk ukn uku un- unb unk unn uns unu usb usk usn uss usu uun uus uuu