-er bbb bbd bbe bbg bbr bdb bdd bde bdg bdr bdv be- beb bed bee beg ber bev bgb bgd bge bgg bgr bgv brb brd bre brg brr brv bvb bvd bve bvg bvr bvv dbb dbd dbe dbg dbr dbv ddb ddd dde ddg ddr de- deb ded dee deg der dev dgd dge dgg dgr drb drd dre drg drr drv dvb dvd dve dvg dvr ebb ebd ebe ebg ebr ebv ed- edb edd ede edg edr eeb eed eee eeg eer eev egb egd ege egg egr erb erd ere erg err erv evb evd eve evg evr evv g-d gbd gbe gbg gbr gbv gdb gdd gde gdr gdv ge- geb ged gee geg ger gev ggb ggd ggg ggr ggv grb grd gre grg grr grv gvb gvd gve gvg gvr rbb rbd rbe rbg rbr rdb rdd rde rdg rdr rdv re- reb red ree reg rer rev rgb rgd rge rgg rgr rgv rrb rrd rrg rrr rvb rvd rve rvg rvr rvv v-e vbd vbg vbr vbv vdb vdd vde vdg vdr vdv veb ved vee veg ver vgg vgr vrb vrd vre vrg vrr vvb vvg vvr vvv