bbb bbi bbn bbo bbr bi- bib bii bin bio bir biz bnb bni bnn bno bnr bnz bob boi bon boo bor boz brb bri brn bro brr brz bzn bzo bzr bzz ibb ibi ibn ibo ibr ibz iib iii iin iio iir in- inb ini inn ino inr io- iob ioi ion ioo ior ir- irb iri irn iro irr izi izo izz n-i nbb nbi nbn nbo nbr nib nii nin nio nir niz nnb nni nnn nno nnz no- nob noi non noo nor noz nrb nri nrn nro nrr nrz nzb nzi nzo nzz o-i ob- obb obi obn obo obr oib oii oin oio oir oiz on- onb oni onn ono onr oo- oob ooi oon ooo oor or- orb ori orn oro orr orz ozo ozz rbb rbi rbn rbo rbr rib rii rin rio rir riz rnb rni rnn rno rnr rnz rob roi ron roo ror roz rrb rri rrn rrr rzb rzo zbb zbr zib zin zio zir ziz znn zno zo- zob zoi zon zoo zor zro zzr zzz