a-a a-b aaa aab aad aag aao aar aax ab- aba abb abd abg abo abr abx ad- ada adb add adg ado adr adx ag- aga agb agd agg ago agr agx aoa aob aod aog aoo aor aox ar- ara arb ard arg aro arr arx ax- axa axo axr axx baa bab bad bag bao bar bax bba bbb bbd bbg bbo bbr bbx bda bdb bdd bdg bdo bdr bdx bga bgb bgd bgg bgo bgr bgx boa bob bod bog boo bor box bra brb brd brg bro brr brx bxb bxd bxo bxx daa dab dad dag dao dar dax dba dbb dbd dbg dbo dbr dbx dda ddb ddd ddg ddo ddr ddx dga dgd dgg dgr doa dob dod dog doo dor dox dra drb drd drg dro drr drx dxd dxo dxr dxx g-d gaa gab gad gag gao gar gba gbd gbg gbo gbr gbx gda gdb gdd gdo gdr gdx gga ggb ggd ggg ggo ggr goa gob god gog goo gor gox gra grb grd grg gro grr grx gxa oaa oab oad oag oao oar oax ob- oba obb obd obg obo obr obx oda odb odd odg odo odr oga ogd ogg ogo ogx oo- ooa oob ood oog ooo oor oox or- ora orb ord org oro orr orx ox- oxa oxb oxo oxx ra- raa rab rad rag rao rar rax rba rbb rbd rbg rbo rbr rbx rda rdb rdd rdg rdo rdr rdx rga rgb rgd rgg rgo rgr rgx roa rob rod rog roo ror rox rra rrb rrd rrg rrr rxr xaa xad xag xar xbr xbx xda xdb xdr xoa xod xog xoo xor xox xrd xrx xxo xxx