a-a a-b a-c aaa aab aac aad aag aar ab- aba abb abc abd abg abr ac- aca acb acc acd acg acr ad- ada adb adc add adg adr ag- aga agb agc agd agg agr ar- ara arb arc ard arg arr baa bab bac bad bag bar bba bbb bbc bbd bbg bbr bca bcb bcc bcd bcg bcr bda bdb bdc bdd bdg bdr bga bgb bgc bgd bgg bgr bra brb brd brg brr c-- caa cab cac cad cag car cba cbb cbc cbd cbg cbr cca ccb ccc ccd ccg ccr cda cdb cdc cdd cdg cdr cga cgb cgc cgd cgg cgr cra crb crc crd crg crr daa dab dac dad dag dar dba dbb dbc dbd dbg dbr dca dcb dcc dcd dcg dcr dda ddb ddc ddd ddg ddr dga dgc dgd dgg dgr dra drb drc drd drg drr g-d gaa gab gac gad gag gar gba gbc gbd gbg gbr gca gcb gcc gcd gcg gcr gda gdb gdc gdd gdr gga ggb ggc ggd ggg ggr gra grb grc grd grg grr ra- raa rab rac rad rag rar rba rbb rbc rbd rbg rbr rca rcb rcc rcd rcg rcr rda rdb rdc rdd rdg rdr rga rgb rgc rgd rgg rgr rra rrb rrc rrd rrg rrr