-er -ey a-a a-b a-t aaa aab aad aae aar aat aay ab- aba abb abd abe abr abt aby ad- ada adb add ade adr adt ady aea aeb aed aee aer aet aey ar- ara arb ard are arr art ary at- ata atb atd ate atr att ay- aya ayd aye ayr ayt baa bab bad bae bar bat bay bba bbb bbd bbe bbr bbt bby bda bdb bdd bde bdr bdt bdy be- bea beb bed bee ber bet bey bra brb brd bre brr brt bry bta btb btd bte btr btt bty by- bya byd bye byr byt daa dab dad dae dar dat day dba dbb dbd dbe dbr dbt dby dda ddb ddd dde ddr ddt ddy de- dea deb ded dee der det dey dra drb drd dre drr drt dry dta dtb dtd dte dtr dtt dty dy- dya dyb dyd dye dyr dyy eaa eab ead eae ear eat eba ebb ebd ebe ebr ebt eby ed- eda edb edd ede edr edt edy eea eeb eed eee eer eet eey era erb erd ere err ert ery eta etb etd ete etr ett ety eya eyd eye eyr eyt ra- raa rab rad rae rar rat ray rba rbb rbd rbe rbr rbt rda rdb rdd rde rdr rdt rdy re- rea reb red ree rer ret rey rra rrb rrd rrr rrt rta rtb rtd rte rtr rtt rty ry- rya ryd rye ryr ryy taa tab tad tae tar tat tay tba tbb tbd tbe tbr tbt tda tdb tdd tde tdr tdt tdy te- tea teb ted tee ter tet tey tra trb trd tre trr trt try tta ttb ttd tte ttr ttt tty tya tyd tye tyr tyt yaa yab yad yae yar yat yay ybe ybr yby yda yde ydt ydy yea yeb yed yee yer yet yey yra yre yrt yta ytd yte ytr ytt yyb yye yyt yyy