a-a a-b aaa aab aad aag aao aau ab- aba abb abd abg abo abu ad- ada adb add adg ado adu ag- aga agb agd agg ago agu aoa aob aod aog aoo aou au- aua aub aud aug auo b-u baa bab bad bag bao bau bba bbb bbd bbg bbo bbu bda bdb bdd bdg bdo bdu bga bgb bgd bgg bgo bgu boa bob bod bog boo bou bua bub bud bug buo buu daa dab dad dag dao dau dba dbb dbd dbg dbo dbu dda ddb ddd ddg ddo ddu dga dgd dgg dgu doa dob dod dog doo dou dua dub dud dug duo g-d gaa gab gad gag gao gau gba gbd gbg gbo gbu gda gdb gdd gdo gdu gga ggb ggd ggg ggo ggu goa gob god gog goo gou gu- gua gub gud gug guo guu oaa oab oad oag oao oau ob- oba obb obd obg obo obu oda odb odd odg odo odu oga ogd ogg ogo oo- ooa oob ood oog ooo ou- oua oud ouo ua- uaa uab uad uag uao uau uba ubb ubg ubo ubu uda udb udd udg udo udu uga ugb ugg ugo ugu uoa uob uod uog uoo uua uug uuu