-er -ey a-a a-b aaa aab aae aar aav aay ab- aba abb abe abr abv aby aea aeb aee aer aev aey ar- ara arb are arr arv ary av- ava avb ave avr avy ay- aya aye ayr baa bab bae bar bav bay bba bbb bbe bbr bby be- bea beb bee ber bev bey bra brb bre brr brv bry bva bvb bve bvr bvv by- bya bye byr eaa eab eae ear eav eba ebb ebe ebr ebv eby eea eeb eee eer eev eey era erb ere err erv ery eva evb eve evr evv evy eya eye eyr ra- raa rab rae rar rav ray rba rbb rbe rbr re- rea reb ree rer rev rey rra rrb rrr rva rvb rve rvr rvv rvy ry- rya rye ryr ryy v-a v-e vaa vab vae var vav vay vba vbr vbv vea veb vee ver vey vra vrb vre vrr vry vva vvb vvr vvv vye yaa yab yae yar yav yay ybe ybr yby yea yeb yee yer yev yey yra yre yva yve yvr yvy yyb yye yyy