-er -ey ddd dde ddo ddr ddx ddy de- ded dee deo der dex dey dod doe doo dor dox doy drd dre dro drr drx dry dxd dxo dxr dxx dy- dyd dye dyo dyr dyy ed- edd ede edo edr edx edy eed eee eeo eer eex eey eo- eod eoe eoo eor erd ere ero err ery ex- exd exe exo exr exx exy eyd eye eyo eyr odd ode odo odr oed oee oeo oer oex oey oo- ood ooo oor oox or- ord ore oro orr orx ory ox- oxo oxx oxy oyd oye oyo rdd rde rdo rdr rdx rdy re- red ree reo rer rex rey rod roe roo ror rox roy rrd rrr rxr ry- ryd rye ryo ryr ryy xde xdr xed xee xer xex xod xoo xor xox xrd xrx xry xxo xxx xxy xyr xyy yde ydo ydy yed yee yeo yer yex yey yod yoe yoo yor yox yoy yre yro yxe yxy yye yyy