bbb bbi bbk bbn bbo bbs bi- bib bii bik bin bio bis bkb bkk bkn bko bks bnb bni bnk bnn bno bns bob boi bok bon boo bos bsb bsi bsk bsn bso bss ibb ibi ibk ibn ibo ibs iib iii iin iio iis ikb iki ikk iko iks in- inb ini ink inn ino ins io- iob ioi ion ioo ios is- isb isi isk isn iso iss kbb kbi kbk kbn kbo kbs kib kii kik kin kio kis kkb kki kkk kkn kks kn- kni knk knn kno kob koi kok kon koo kos ksb ksi ksk ksn kso kss n-i nbb nbi nbk nbn nbo nbs nib nii nik nin nio nis nki nkk nkn nko nks nnb nni nnk nnn nno nns no- nob noi nok non noo nos nsb nsi nsk nsn nso nss o-i ob- obb obi obk obn obo obs oib oii oik oin oio ois okb oki okk oko oks on- onb oni onk onn ono ons oo- oob ooi ook oon ooo oos os- osb osi osk osn oso oss sbb sbi sbk sbn sbo sbs sib sii sik sin sio sis sk- skb ski skk sko sks snb sni snk snn sno sns sob soi sok son soo sos ss- ssb ssi ssk ssn sso sss