bbb bbi bbk bbn bbs bi- bib bii bik bin bis bkb bkk bkn bks bnb bni bnk bnn bns bsb bsi bsk bsn bss ibb ibi ibk ibn ibs iib iii iin iis ikb iki ikk iks in- inb ini ink inn ins is- isb isi isk isn iss kbb kbi kbk kbn kbs kib kii kik kin kis kkb kki kkk kkn kks kn- kni knk knn ksb ksi ksk ksn kss n-i nbb nbi nbk nbn nbs nib nii nik nin nis nki nkk nkn nks nnb nni nnk nnn nns nsb nsi nsk nsn nss sbb sbi sbk sbn sbs sib sii sik sin sis sk- skb ski skk sks snb sni snk snn sns ss- ssb ssi ssk ssn sss