a-a a-b aaa aab aad aag aar aas ab- aba abb abd abg abr abs ad- ada adb add adg adr ads ag- aga agb agd agg agr ags ar- ara arb ard arg arr ars as- asa asb asd asg asr ass baa bab bad bag bar bas bba bbb bbd bbg bbr bbs bda bdb bdd bdg bdr bds bga bgb bgd bgg bgr bgs bra brb brd brg brr brs bsa bsb bsd bsg bsr bss daa dab dad dag dar das dba dbb dbd dbg dbr dbs dda ddb ddd ddg ddr dds dga dgd dgg dgr dgs dra drb drd drg drr drs dsa dsb dsd dsg dsr dss g-d gaa gab gad gag gar gas gba gbd gbg gbr gbs gda gdb gdd gdr gds gga ggb ggd ggg ggr ggs gra grb grd grg grr grs gsa gsb gsd gsg gsr gss ra- raa rab rad rag rar ras rba rbb rbd rbg rbr rbs rda rdb rdd rdg rdr rds rga rgb rgd rgg rgr rgs rra rrb rrd rrg rrr rrs rsa rsb rsd rsg rsr rss saa sab sad sag sar sas sba sbb sbd sbg sbr sbs sda sdb sdd sdg sdr sds sga sgb sgd sgg sgr sgs sr- sra srb srd srg srr srs ss- ssa ssb ssd ssg ssr sss