a-a a-b aaa aab aad aag aah aao ab- aba abb abd abg abh abo ad- ada adb add adg adh ado ag- aga agb agd agg agh ago aha ahb ahd ahg ahh aho aoa aob aod aog aoh aoo baa bab bad bag bah bao bba bbb bbd bbg bbh bbo bda bdb bdd bdg bdh bdo bga bgb bgd bgg bgh bgo bha bhb bhd bhg bhh bho boa bob bod bog boh boo daa dab dad dag dah dao dba dbb dbd dbg dbh dbo dda ddb ddd ddg ddh ddo dga dgd dgg dgh dh- dha dhb dhd dhh dho doa dob dod dog doh doo g-d gaa gab gad gag gah gao gba gbd gbg gbh gbo gda gdb gdd gdh gdo gga ggb ggd ggg ggh ggo gha ghb ghd ghg ghh gho goa gob god gog goh goo haa hab had hag hah hao hba hbb hbd hbg hbh hbo hda hdb hdd hdg hdh hdo hga hgb hgg hgh hgo hha hhb hhd hhg hhh hho hoa hob hod hog hoh hoo oaa oab oad oag oah oao ob- oba obb obd obg obh obo oda odb odd odg odh odo oga ogd ogg ogh ogo oha ohd ohg ohh oho oo- ooa oob ood oog ooh ooo