-er bbb bbe bbi bbr be- beb bee bei ber bev bez bi- bib bie bii bir biv biz brb bre bri brr brv brz bvb bve bvi bvr bvv bze bzr bzz ebb ebe ebi ebr ebv eeb eee eer eev eib eie eii eir eiv erb ere eri err erv erz evb eve evi evr evv eze ezr ezz i-v ibb ibe ibi ibr ibv ibz ie- iee iei ier iev iib iie iii iir ir- irb ire iri irr irv ivb ive ivi ivr ivv ize izi izz rbb rbe rbi rbr re- reb ree rei rer rev rez rib rie rii rir riv riz rrb rri rrr rvb rve rvi rvr rvv rzb rze v-e vbi vbr vbv vbz veb vee vei ver vez vi- vib vie vii vir viv viz vrb vre vri vrr vvb vvi vvr vvv vvz zbb zbr zbv zeb zee zer zev zez zib zie zir ziv ziz zvi zzr zzz