bbb bbi bbk bbn bbo bbs bbx bi- bib bii bik bin bio bis bix bkb bkk bkn bko bks bkx bnb bni bnk bnn bno bns bnx bob boi bok bon boo bos box bsb bsi bsk bsn bso bss bsx bxb bxi bxn bxo bxx ibb ibi ibk ibn ibo ibs ibx iib iii iin iio iis iix ikb iki ikk iko iks ikx in- inb ini ink inn ino ins inx io- iob ioi ion ioo ios is- isb isi isk isn iso iss ixi ixn kbb kbi kbk kbn kbo kbs kbx kib kii kik kin kio kis kix kkb kki kkk kkn kks kn- kni knk knn kno knx kob koi kok kon koo kos ksb ksi ksk ksn kso kss kxo n-i nbb nbi nbk nbn nbo nbs nbx nib nii nik nin nio nis nix nki nkk nkn nko nks nnb nni nnk nnn nno nns no- nob noi nok non noo nos nox nsb nsi nsk nsn nso nss nsx o-i ob- obb obi obk obn obo obs obx oib oii oik oin oio ois okb oki okk oko oks on- onb oni onk onn ono ons onx oo- oob ooi ook oon ooo oos oox os- osb osi osk osn oso oss osx ox- oxb oxi oxn oxo oxx sbb sbi sbk sbn sbo sbs sbx sib sii sik sin sio sis six sk- skb ski skk sko sks skx snb sni snk snn sno sns sob soi sok son soo sos sox ss- ssb ssi ssk ssn sso sss ssx sxi sxn sxs xbx xii xin xio xis xix xkb xks xnk xno xns xoi xok xon xoo xos xox xsb xsi xss xxi xxo xxx