-er -ey c-- ccc ccd cce ccr ccv cdc cdd cde cdr cdv cdy ce- cec ced cee cer cev cey crc crd cre crr crv cry cvc cvd cve cvr cvv cyc cyd cye cyr dcc dcd dce dcr dcv ddc ddd dde ddr ddy de- dec ded dee der dev dey drc drd dre drr drv dry dvc dvd dve dvr dy- dyc dyd dye dyr dyy ec- ecc ecd ece ecr ecv ed- edc edd ede edr edy eec eed eee eer eev eey erc erd ere err erv ery evc evd eve evr evv evy eyc eyd eye eyr rcc rcd rce rcr rcv rdc rdd rde rdr rdv rdy re- rec red ree rer rev rey rrc rrd rrr rvc rvd rve rvr rvv rvy ry- ryc ryd rye ryr ryy v-e vcc vcd vce vcr vcy vdc vdd vde vdr vdv vec ved vee ver vey vrc vrd vre vrr vry vvc vvr vvv vyd vye ycc ycd yce ycv ycy yde ydy yec yed yee yer yev yey yrc yre yve yvr yvy yyc yye yyy