-er -ey a-a a-b aaa aab aae aag aao aar aay ab- aba abb abe abg abo abr aby aea aeb aee aeg aeo aer aey ag- aga agb age agg ago agr agy aoa aob aoe aog aoo aor ar- ara arb are arg aro arr ary ay- aya aye ayo ayr baa bab bae bag bao bar bay bba bbb bbe bbg bbo bbr bby be- bea beb bee beg beo ber bey bga bgb bge bgg bgo bgr boa bob boe bog boo bor boy bra brb bre brg bro brr bry by- bya bye byg byo byr eaa eab eae eag eao ear eba ebb ebe ebg ebo ebr eby eea eeb eee eeg eeo eer eey ega egb ege egg ego egr egy eo- eoa eob eoe eog eoo eor era erb ere erg ero err ery eya eye eyo eyr gaa gab gae gag gao gar gay gba gbe gbg gbo gbr gby ge- gea geb gee geg geo ger gey gga ggb ggg ggo ggr goa gob goe gog goo gor goy gra grb gre grg gro grr gry gy- gya gyb gye gyo gyr oaa oab oae oag oao oar ob- oba obb obe obg obo obr oby oea oeb oee oeg oeo oer oey oga oge ogg ogo ogy oo- ooa oob oog ooo oor or- ora orb ore org oro orr ory oya oye oyo ra- raa rab rae rag rao rar ray rba rbb rbe rbg rbo rbr re- rea reb ree reg reo rer rey rga rgb rge rgg rgo rgr roa rob roe rog roo ror roy rra rrb rrg rrr ry- rya rye ryg ryo ryr ryy yaa yab yae yag yao yar yay ybe ybg ybr yby yea yeb yee yeg yeo yer yey yga ygo yob yoe yog yoo yor yoy yra yre yrg yro yyb yye yyg yyy