a-a a-b aaa aab aag aam aan aar ab- aba abb abg abm abn abr ag- aga agb agg agm agn agr ama amb amg amm amn amr an- ana anb ang anm ann anr ar- ara arb arg arm arn arr baa bab bag bam ban bar bba bbb bbg bbm bbn bbr bga bgb bgg bgm bgn bgr bma bmb bmg bmm bmn bmr bna bnb bng bnn bnr bra brb brg brm brn brr gaa gab gag gam gan gar gba gbg gbm gbn gbr gga ggb ggg ggm ggn ggr gma gmb gmg gmm gmn gmr gna gnb gnm gnn gnr gra grb grg grm grn grr m-r maa mab mag mam man mar mba mbb mbg mbm mbr mga mgb mgm mgn mgr mma mmb mmg mmm mmn mmr mna mnb mng mnm mnn mnr mra mrb mrg mrm mrn mrr naa nab nag nam nan nar nba nbb nbg nbm nbn nbr nga ngb ngg ngm ngn nma nmb nmg nmm nmn nmr nna nnb nng nnm nnn nra nrb nrg nrm nrn nrr ra- raa rab rag ram ran rar rba rbb rbg rbm rbn rbr rga rgb rgg rgn rgr rma rmb rmg rmm rmn rmr rna rnb rng rnm rnn rnr rra rrb rrg rrm rrn rrr