-er -ey a-a a-b aaa aab aae aao aar aay ab- aba abb abe abo abr aby aea aeb aee aeo aer aey aoa aob aoe aoo aor ar- ara arb are aro arr ary ay- aya aye ayo ayr baa bab bae bao bar bay bba bbb bbe bbo bbr bby be- bea beb bee beo ber bey boa bob boe boo bor boy bra brb bre bro brr bry by- bya bye byo byr eaa eab eae eao ear eba ebb ebe ebo ebr eby eea eeb eee eeo eer eey eo- eoa eob eoe eoo eor era erb ere ero err ery eya eye eyo eyr oaa oab oae oao oar ob- oba obb obe obo obr oby oea oeb oee oeo oer oey oo- ooa oob ooo oor or- ora orb ore oro orr ory oya oye oyo ra- raa rab rae rao rar ray rba rbb rbe rbo rbr re- rea reb ree reo rer rey roa rob roe roo ror roy rra rrb rrr ry- rya rye ryo ryr ryy yaa yab yae yao yar yay ybe ybr yby yea yeb yee yeo yer yey yob yoe yoo yor yoy yra yre yro yyb yye yyy