bbb bbi bbk bbn bbo bbr bbs bi- bib bii bik bin bio bir bis bkb bkk bkn bko bkr bks bnb bni bnk bnn bno bnr bns bob boi bok bon boo bor bos brb bri brk brn bro brr brs bsb bsi bsk bsn bso bsr bss ibb ibi ibk ibn ibo ibr ibs iib iii iin iio iir iis ikb iki ikk iko ikr iks in- inb ini ink inn ino inr ins io- iob ioi ion ioo ior ios ir- irb iri irk irn iro irr irs is- isb isi isk isn iso isr iss kbb kbi kbk kbn kbo kbr kbs kib kii kik kin kio kir kis kkb kki kkk kkn kkr kks kn- kni knk knn kno knr kob koi kok kon koo kor kos kri krk krn kro krr krs ksb ksi ksk ksn kso ksr kss n-i nbb nbi nbk nbn nbo nbr nbs nib nii nik nin nio nir nis nki nkk nkn nko nkr nks nnb nni nnk nnn nno nns no- nob noi nok non noo nor nos nrb nri nrk nrn nro nrr nrs nsb nsi nsk nsn nso nsr nss o-i ob- obb obi obk obn obo obr obs oib oii oik oin oio oir ois okb oki okk oko okr oks on- onb oni onk onn ono onr ons oo- oob ooi ook oon ooo oor oos or- orb ori ork orn oro orr ors os- osb osi osk osn oso osr oss rbb rbi rbk rbn rbo rbr rbs rib rii rik rin rio rir ris rkb rkk rko rks rnb rni rnn rno rnr rns rob roi rok ron roo ror ros rrb rri rrk rrn rrr rrs rsb rsi rsk rsn rso rsr rss sbb sbi sbk sbn sbo sbr sbs sib sii sik sin sio sir sis sk- skb ski skk sko skr sks snb sni snk snn sno snr sns sob soi sok son soo sor sos sr- srb sri srk srn sro srr srs ss- ssb ssi ssk ssn sso ssr sss