-er -ey ddd dde ddr ddu ddx ddy de- ded dee der deu dex dey drd dre drr dru drx dry dud due dur dux duy dxd dxr dxx dy- dyd dye dyr dyu dyy ed- edd ede edr edu edx edy eed eee eer eex eey erd ere err eru ery eu- eud eue eur eux ex- exd exe exr exu exx exy eyd eye eyr rdd rde rdr rdu rdx rdy re- red ree rer reu rex rey rrd rrr rru rud rue rur ruu rux ruy rxr ry- ryd rye ryr ryu ryy udd ude udr udu udx ued uee uer uey ur- urd ure urr uru urx ury uue uur uuu uxr uxu uyu xde xdr xed xee xer xeu xex xrd xrx xry xue xxx xxy xyr xyy yde ydy yed yee yer yex yey yre yru yud yue yur yuu yux yuy yxe yxy yye yyu yyy