bbb bbi bbk bbn bbr bbs bi- bib bii bik bin bir bis bkb bkk bkn bkr bks bnb bni bnk bnn bnr bns brb bri brk brn brr brs bsb bsi bsk bsn bsr bss ibb ibi ibk ibn ibr ibs iib iii iin iir iis ikb iki ikk ikr iks in- inb ini ink inn inr ins ir- irb iri irk irn irr irs is- isb isi isk isn isr iss kbb kbi kbk kbn kbr kbs kib kii kik kin kir kis kkb kki kkk kkn kkr kks kn- kni knk knn knr kri krk krn krr krs ksb ksi ksk ksn ksr kss n-i nbb nbi nbk nbn nbr nbs nib nii nik nin nir nis nki nkk nkn nkr nks nnb nni nnk nnn nns nrb nri nrk nrn nrr nrs nsb nsi nsk nsn nsr nss rbb rbi rbk rbn rbr rbs rib rii rik rin rir ris rkb rkk rks rnb rni rnn rnr rns rrb rri rrk rrn rrr rrs rsb rsi rsk rsn rsr rss sbb sbi sbk sbn sbr sbs sib sii sik sin sir sis sk- skb ski skk skr sks snb sni snk snn snr sns sr- srb sri srk srn srr srs ss- ssb ssi ssk ssn ssr sss