a-a a-b aaa aab aad aag aao aay ab- aba abb abd abg abo aby ad- ada adb add adg ado ady ag- aga agb agd agg ago agy aoa aob aod aog aoo ay- aya ayd ayo baa bab bad bag bao bay bba bbb bbd bbg bbo bby bda bdb bdd bdg bdo bdy bga bgb bgd bgg bgo boa bob bod bog boo boy by- bya byd byg byo daa dab dad dag dao day dba dbb dbd dbg dbo dby dda ddb ddd ddg ddo ddy dga dgd dgg doa dob dod dog doo doy dy- dya dyb dyd dyo dyy g-d gaa gab gad gag gao gay gba gbd gbg gbo gby gda gdb gdd gdo gga ggb ggd ggg ggo goa gob god gog goo goy gy- gya gyb gyd gyo oaa oab oad oag oao ob- oba obb obd obg obo oby oda odb odd odg odo oga ogd ogg ogo ogy oo- ooa oob ood oog ooo oya oyd oyo yaa yab yad yag yao yay ybg yby yda ydg ydo ydy yga ygo yob yod yog yoo yoy yyb yyg yyy