a-a a-b a-t aaa aab aad aag aao aar aat ab- aba abb abd abg abo abr abt ad- ada adb add adg ado adr adt ag- aga agb agd agg ago agr agt aoa aob aod aog aoo aor aot ar- ara arb ard arg aro arr art at- ata atb atd atg ato atr att baa bab bad bag bao bar bat bba bbb bbd bbg bbo bbr bbt bda bdb bdd bdg bdo bdr bdt bga bgb bgd bgg bgo bgr bgt boa bob bod bog boo bor bot bra brb brd brg bro brr brt bta btb btd btg bto btr btt daa dab dad dag dao dar dat dba dbb dbd dbg dbo dbr dbt dda ddb ddd ddg ddo ddr ddt dga dgd dgg dgr dgt doa dob dod dog doo dor dot dra drb drd drg dro drr drt dta dtb dtd dtg dto dtr dtt g-d gaa gab gad gag gao gar gat gba gbd gbg gbo gbr gbt gda gdb gdd gdo gdr gdt gga ggb ggd ggg ggo ggr ggt goa gob god gog goo gor got gra grb grd grg gro grr grt gta gtb gtd gtg gto gtr gtt oaa oab oad oag oao oar oat ob- oba obb obd obg obo obr obt oda odb odd odg odo odr odt oga ogd ogg ogo ogt oo- ooa oob ood oog ooo oor oot or- ora orb ord org oro orr ort ot- ota otb otd otg oto otr ott ra- raa rab rad rag rao rar rat rba rbb rbd rbg rbo rbr rbt rda rdb rdd rdg rdo rdr rdt rga rgb rgd rgg rgo rgr rgt roa rob rod rog roo ror rot rra rrb rrd rrg rrr rrt rta rtb rtd rtg rto rtr rtt taa tab tad tag tao tar tat tba tbb tbd tbg tbo tbr tbt tda tdb tdd tdg tdo tdr tdt tga tgb tgg tgo tgr tgt to- toa tob tod tog too tor tot tra trb trd trg tro trr trt tta ttb ttd ttg tto ttr ttt