bbb bbi bbn bbo bbs bi- bib bii bin bio bis biz bnb bni bnn bno bns bnz bob boi bon boo bos boz bsb bsi bsn bso bss bzn bzo bzs bzz ibb ibi ibn ibo ibs ibz iib iii iin iio iis in- inb ini inn ino ins io- iob ioi ion ioo ios is- isb isi isn iso iss izi izo izz n-i nbb nbi nbn nbo nbs nib nii nin nio nis niz nnb nni nnn nno nns nnz no- nob noi non noo nos noz nsb nsi nsn nso nss nsz nzb nzi nzo nzs nzz o-i ob- obb obi obn obo obs oib oii oin oio ois oiz on- onb oni onn ono ons oo- oob ooi oon ooo oos os- osb osi osn oso oss ozo ozs ozz sbb sbi sbn sbo sbs sib sii sin sio sis snb sni snn sno sns sob soi son soo sos soz ss- ssb ssi ssn sso sss ssz szi zbb zbs zib zin zio zis ziz znn zno zns zo- zob zoi zon zoo zos zsi zsz zzs zzz