-er -ey a-a a-b aaa aab aad aae aak aar aay ab- aba abb abd abe abk abr aby ad- ada adb add ade adk adr ady aea aeb aed aee aek aer aey aka akb akd ake akk akr ar- ara arb ard are ark arr ary ay- aya ayd aye ayk ayr baa bab bad bae bak bar bay bba bbb bbd bbe bbk bbr bby bda bdb bdd bde bdk bdr bdy be- bea beb bed bee bek ber bey bka bkb bke bkk bkr bra brb brd bre brk brr bry by- bya byd bye byk byr daa dab dad dae dak dar day dba dbb dbd dbe dbk dbr dby dda ddb ddd dde ddk ddr ddy de- dea deb ded dee dek der dey dka dkb dke dkk dkr dra drb drd dre drk drr dry dy- dya dyb dyd dye dyk dyr dyy eaa eab ead eae eak ear eba ebb ebd ebe ebk ebr eby ed- eda edb edd ede edk edr edy eea eeb eed eee eek eer eey eka ekb ekd eke ekr eky era erb erd ere erk err ery eya eyd eye eyr ka- kaa kab kad kae kak kar kay kba kbb kbd kbe kbk kbr kda kdb kde kdk kdr kdy ke- kea keb ked kee kek ker key kkb kke kkk kkr kky kra krd krk krr kry kya kyd kye kyr ra- raa rab rad rae rak rar ray rba rbb rbd rbe rbk rbr rda rdb rdd rde rdr rdy re- rea reb red ree rek rer rey rkb rke rkk rky rra rrb rrd rrk rrr ry- rya ryd rye ryk ryr ryy yaa yab yad yae yak yar yay ybe ybr yby yda yde ydy yea yeb yed yee yek yer yey yka ykk yra yre yyb yye yyy