a-a a-b aaa aab aad aag aan aar ab- aba abb abd abg abn abr ad- ada adb add adg adn adr ag- aga agb agd agg agn agr an- ana anb and ang ann anr ar- ara arb ard arg arn arr baa bab bad bag ban bar bba bbb bbd bbg bbn bbr bda bdb bdd bdg bdr bga bgb bgd bgg bgn bgr bna bnb bnd bng bnn bnr bra brb brd brg brn brr daa dab dad dag dan dar dba dbb dbd dbg dbn dbr dda ddb ddd ddg ddn ddr dga dgd dgg dgn dgr dna dnb dnd dng dnn dnr dra drb drd drg drn drr g-d gaa gab gad gag gan gar gba gbd gbg gbn gbr gda gdb gdd gdn gdr gga ggb ggd ggg ggn ggr gna gnb gnd gnn gnr gra grb grd grg grn grr naa nab nad nag nan nar nba nbb nbd nbg nbn nbr nda ndb ndd ndg ndn ndr nga ngb ngd ngg ngn nna nnb nng nnn nra nrb nrd nrg nrn nrr ra- raa rab rad rag ran rar rba rbb rbd rbg rbn rbr rda rdb rdd rdg rdn rdr rga rgb rgd rgg rgn rgr rna rnb rnd rng rnn rnr rra rrb rrd rrg rrn rrr