a-a a-b aaa aab aad aag aao ab- aba abb abd abg abo ad- ada adb add adg ado ag- aga agb agd agg ago aoa aob aod aog aoo baa bab bad bag bao bba bbb bbd bbg bbo bda bdb bdd bdg bdo bga bgb bgd bgg bgo boa bob bod bog boo daa dab dad dag dao dba dbb dbd dbg dbo dda ddb ddd ddg ddo dga dgd dgg doa dob dod dog doo g-d gaa gab gad gag gao gba gbd gbg gbo gda gdb gdd gdo gga ggb ggd ggg ggo goa gob god gog goo oaa oab oad oag oao ob- oba obb obd obg obo oda odb odd odg odo oga ogd ogg ogo oo- ooa oob ood oog ooo