a-a a-b aaa aab aad aag aah ab- aba abb abd abg abh ad- ada adb add adg adh ag- aga agb agd agg agh aha ahb ahd ahg ahh baa bab bad bag bah bba bbb bbd bbg bbh bda bdb bdd bdg bdh bga bgb bgd bgg bgh bha bhb bhd bhg bhh daa dab dad dag dah dba dbb dbd dbg dbh dda ddb ddd ddg ddh dga dgd dgg dgh dh- dha dhb dhd dhh g-d gaa gab gad gag gah gba gbd gbg gbh gda gdb gdd gdh gga ggb ggd ggg ggh gha ghb ghd ghg ghh haa hab had hag hah hba hbb hbd hbg hbh hda hdb hdd hdg hdh hga hgb hgg hgh hha hhb hhd hhg hhh