a-a a-b a-z aaa aab aad aag aao aar aaz ab- aba abb abd abg abo abr abz ad- ada adb add adg ado adr adz ag- aga agb agd agg ago agr agz aoa aob aod aog aoo aor ar- ara arb ard arg aro arr arz az- aza azb azd azg azo azz baa bab bad bag bao bar baz bba bbb bbd bbg bbo bbr bda bdb bdd bdg bdo bdr bdz bga bgb bgd bgg bgo bgr bgz boa bob bod bog boo bor boz bra brb brd brg bro brr brz bza bzd bzo bzr bzz daa dab dad dag dao dar daz dba dbb dbd dbg dbo dbr dbz dda ddb ddd ddg ddo ddr ddz dga dgd dgg dgr dgz doa dob dod dog doo dor doz dra drb drd drg dro drr drz dza dzb dzd dzo dzr g-d gaa gab gad gag gao gar gaz gba gbd gbg gbo gbr gbz gda gdb gdd gdo gdr gga ggb ggd ggg ggo ggr ggz goa gob god gog goo gor goz gra grb grd grg gro grr gza gzo gzr 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 orz oza ozo ozz ra- raa rab rad rag rao rar raz rba rbb rbd rbg rbo rbr rda rdb rdd rdg rdo rdr rga rgb rgd rgg rgo rgr roa rob rod rog roo ror roz rra rrb rrd rrg rrr rza rzb rzo z-g zaa zab zad zag zao zar zaz zbb zbr zgb zgg zo- zoa zob zod zog zoo zor zro zzr zzz