a-a a-b aaa aab aad aag aao aar ab- aba abb abd abg abo abr ad- ada adb add adg ado adr ag- aga agb agd agg ago agr aoa aob aod aog aoo aor ar- ara arb ard arg aro arr baa bab bad bag bao bar bba bbb bbd bbg bbo bbr bda bdb bdd bdg bdo bdr bga bgb bgd bgg bgo bgr boa bob bod bog boo bor bra brb brd brg bro brr daa dab dad dag dao dar dba dbb dbd dbg dbo dbr dda ddb ddd ddg ddo ddr dga dgd dgg dgr doa dob dod dog doo dor dra drb drd drg dro drr g-d gaa gab gad gag gao gar gba gbd gbg gbo gbr gda gdb gdd gdo gdr gga ggb ggd ggg ggo ggr goa gob god gog goo gor gra grb grd grg gro grr oaa oab oad oag oao oar ob- oba obb obd obg obo obr oda odb odd odg odo odr oga ogd ogg ogo oo- ooa oob ood oog ooo oor or- ora orb ord org oro orr ra- raa rab rad rag rao rar rba rbb rbd rbg rbo rbr rda rdb rdd rdg rdo rdr rga rgb rgd rgg rgo rgr roa rob rod rog roo ror rra rrb rrd rrg rrr