-er bbb bbd bbe bbi bbr bdb bdd bde bdi bdr bdv be- beb bed bee bei ber bev bi- bib bid bie bii bir biv brb brd bre bri brr brv bvb bvd bve bvi bvr bvv dbb dbd dbe dbi dbr dbv ddb ddd dde ddi ddr de- deb ded dee dei der dev di- dib did die dii dir div drb drd dre dri drr drv dvb dvd dve dvi dvr ebb ebd ebe ebi ebr ebv ed- edb edd ede edi edr eeb eed eee eer eev eib eid eie eii eir eiv erb erd ere eri err erv evb evd eve evi evr evv i-d i-v ibb ibd ibe ibi ibr ibv idb idd ide idi idr idv ie- ied iee iei ier iev iib iid iie iii iir ir- irb ird ire iri irr irv ivb ivd ive ivi ivr ivv rbb rbd rbe rbi rbr rdb rdd rde rdi rdr rdv re- reb red ree rei rer rev rib rid rie rii rir riv rrb rrd rri rrr rvb rvd rve rvi rvr rvv v-e vbd vbi vbr vbv vdb vdd vde vdi vdr vdv veb ved vee vei ver vi- vib vid vie vii vir viv vrb vrd vre vri vrr vvb vvi vvr vvv