-er -ey a-a a-t aaa aad aae aar aat aax aay ad- ada add ade adr adt adx ady aea aed aee aer aet aex aey ar- ara ard are arr art arx ary at- ata atd ate atr att atx ax- axa axe axr axt axx ay- aya ayd aye ayr ayt ayx daa dad dae dar dat dax day dda ddd dde ddr ddt ddx ddy de- dea ded dee der det dex dey dra drd dre drr drt drx dry dta dtd dte dtr dtt dtx dty dxd dxr dxt dxx dy- dya dyd dye dyr dyy eaa ead eae ear eat eax ed- eda edd ede edr edt edx edy eea eed eee eer eet eex eey era erd ere err ert ery eta etd ete etr ett etx ety ex- exa exd exe exr ext exx exy eya eyd eye eyr eyt ra- raa rad rae rar rat rax ray rda rdd rde rdr rdt rdx rdy re- rea red ree rer ret rex rey rra rrd rrr rrt rta rtd rte rtr rtt rtx rty rxr ry- rya ryd rye ryr ryy t-x taa tad tae tar tat tax tay tda tdd tde tdr tdt tdx tdy te- tea ted tee ter tet tex tey tra trd tre trr trt trx try tta ttd tte ttr ttt ttx tty txe txt tya tyd tye tyr tyt xaa xad xar xat xda xde xdr xdt xed xee xer xet xex xrd xrt xrx xry xtr xtx xty xxx xxy xyr xyy yaa yad yae yar yat yax yay yda yde ydt ydy yea yed yee yer yet yex yey yra yre yrt yta ytd yte ytr ytt yxa yxe yxy yye yyt yyy