-er bbb bbe bbg bbi bbr be- beb bee beg bei ber bev bgb bge bgg bgi bgr bgv bi- bib bie big bii bir biv brb bre brg bri brr brv bvb bve bvg bvi bvr bvv ebb ebe ebg ebi ebr ebv eeb eee eeg eer eev egb ege egg egi egr eib eie eig eii eir eiv erb ere erg eri err erv evb eve evg evi evr evv gbe gbg gbi gbr gbv ge- geb gee geg gei ger gev ggb ggg ggi ggr ggv gib gie gig gii gir giv grb gre grg gri grr grv gvb gve gvg gvi gvr i-v ibb ibe ibg ibi ibr ibv ie- iee ieg iei ier iev igb ige igg igi igr iib iie iii iir ir- irb ire irg iri irr irv ivb ive ivg ivi ivr ivv rbb rbe rbg rbi rbr re- reb ree reg rei rer rev rgb rge rgg rgi rgr rgv rib rie rig rii rir riv rrb rrg rri rrr rvb rve rvg rvi rvr rvv v-e vbg vbi vbr vbv veb vee veg vei ver vgg vgr vi- vib vie vig vii vir viv vrb vre vrg vri vrr vvb vvg vvi vvr vvv