-er -ey eee eer eex eey eqe eqq equ ere erq err eru ery eu- eue eur eux ex- exe exr exu exx exy eye eyr qee qex qqq qqu qre qru qu- que qur qux quy qxe re- ree req rer reu rex rey rrq rrr rru rue rur ruu rux ruy rxr ry- rye ryr ryu ryy uee uer uey ur- ure urr uru urx ury uue uur uuu uxr uxu uyu xee xeq xer xeu xex xrx xry xue xxx xxy xyr xyy yee yer yex yey yqr yre yru yue yur yuu yux yuy yxe yxy yye yyu yyy