-ey a-a a-b aaa aab aad aae aao aay ab- aba abb abd abe abo aby ad- ada adb add ade ado ady aea aeb aed aee aeo aey aoa aob aod aoe aoo ay- aya ayd aye ayo baa bab bad bae bao bay bba bbb bbd bbe bbo bby bda bdb bdd bde bdo bdy be- bea beb bed bee beo bey boa bob bod boe boo boy by- bya byd bye byo daa dab dad dae dao day dba dbb dbd dbe dbo dby dda ddb ddd dde ddo ddy de- dea deb ded dee deo dey doa dob dod doe doo doy dy- dya dyb dyd dye dyo dyy eaa eab ead eae eao eba ebb ebd ebe ebo eby ed- eda edb edd ede edo edy eea eeb eed eee eeo eey eo- eoa eob eod eoe eoo eya eyd eye eyo oaa oab oad oae oao ob- oba obb obd obe obo oby oda odb odd ode odo oea oeb oed oee oeo oey oo- ooa oob ood ooo oya oyd oye oyo yaa yab yad yae yao yay ybe yby yda yde ydo ydy yea yeb yed yee yeo yey yob yod yoe yoo yoy yyb yye yyy