bbb bbg bbi bbo bbr bgb bgg bgi bgo bgr bgv bi- bib big bii bio bir biv bob bog boi boo bor bov brb brg bri bro brr brv bvb bvg bvi bvo bvr bvv gbg gbi gbo gbr gbv ggb ggg ggi ggo ggr ggv gib gig gii gio gir giv gob gog goi goo gor gov grb grg gri gro grr grv gvb gvg gvi gvo gvr i-v ibb ibg ibi ibo ibr ibv igb igg igi igo igr iib iii iio iir io- iob iog ioi ioo ior iov ir- irb irg iri iro irr irv ivb ivg ivi ivo ivr ivv o-i ob- obb obg obi obo obr obv ogg ogi ogo oib oii oio oir oiv oo- oob oog ooi ooo oor oov or- orb org ori oro orr orv ov- ovb ovi ovo ovv rbb rbg rbi rbo rbr rgb rgg rgi rgo rgr rgv rib rig rii rio rir riv rob rog roi roo ror rov rrb rrg rri rrr rvb rvg rvi rvo rvr rvv vbg vbi vbo vbr vbv vgg vgo vgr vi- vib vig vii vio vir viv vob vog voi voo vor vov vrb vrg vri vrr vvb vvg vvi vvo vvr vvv