bbb bbg bbi bbo bbr bgb bgg bgi bgo bgr bgz bi- bib big bii bio bir biz bob bog boi boo bor boz brb brg bri bro brr brz bzo bzr bzz gbg gbi gbo gbr gbz ggb ggg ggi ggo ggr ggz gib gig gii gio gir giz gob gog goi goo gor goz grb grg gri gro grr gzo gzr ibb ibg ibi ibo ibr ibz igb igg igi igo igr iib iii iio iir io- iob iog ioi ioo ior ir- irb irg iri iro irr izi izo izz o-i ob- obb obg obi obo obr ogg ogi ogo oib oii oio oir oiz oo- oob oog ooi ooo oor or- orb org ori oro orr orz ozo ozz rbb rbg rbi rbo rbr rgb rgg rgi rgo rgr rib rig rii rio rir riz rob rog roi roo ror roz rrb rrg rri rrr rzb rzo z-g zbb zbr zgb zgg zgi zib zig zio zir ziz zo- zob zog zoi zoo zor zro zzr zzz