b-u bbb bbc bbk bbn bbs bbu bcb bcc bck bcn bcs bcu bkb bkc bkk bkn bks bnb bnc bnk bnn bns bnu bsb bsc bsk bsn bss bsu bub buc buk bun bus buu c-- cbb cbc cbk cbn cbs cbu ccb ccc cck ccn ccs ccu ckb ckc cks cn- cnb cnc cnn cns cnu csb csc csk csn css csu cub cuc cuk cun cus cuu kbb kbc kbk kbn kbs kbu kcb kcc kck kcn kcs kcu kkb kkc kkk kkn kks kku kn- knc knk knn knu ksb ksc ksk ksn kss ksu kub kuc kuk kun kus kuu nbb nbc nbk nbn nbs nbu ncb ncc nck ncn ncs ncu nkc nkk nkn nks nku nnb nnc nnk nnn nns nnu nsb nsc nsk nsn nss nsu nub nuc nuk nun nus nuu sbb sbc sbk sbn sbs sbu scb scc sck scn scs scu sk- skb skc skk sks sku snb snc snk snn sns snu ss- ssb ssc ssk ssn sss ssu sub suc suk sun sus suu ubb ubc ubk ubn ubs ubu ucb ucc uck ucn ucs ucu ukb ukc ukk ukn uku un- unb unc unk unn uns unu usb usc usk usn uss usu uuc uun uus uuu