-er -ey eee eeo eer eet eex eey eo- eoe eoo eor eot ere ero err ert ery ete eto etr ett etx ety ex- exe exo exr ext exx exy eye eyo eyr eyt oee oeo oer oet oex oey oo- ooo oor oot oox or- ore oro orr ort orx ory ot- ote oto otr ott ox- oxo oxt oxx oxy oye oyo re- ree reo rer ret rex rey roe roo ror rot rox roy rrr rrt rte rto rtr rtt rtx rty rxr ry- rye ryo ryr ryy t-x te- tee teo ter tet tex tey to- toe too tor tot tox toy tre tro trr trt trx try tte tto ttr ttt ttx tty txe txt tye tyo tyr tyt xee xer xet xex xoo xor xot xox xrt xrx xry xtr xtx xty xxo xxx xxy xyr xyy yee yeo yer yet yex yey yoe yoo yor yot yox yoy yre yro yrt yte yto ytr ytt yxe yxy yye yyt yyy