a-a a-b aaa aab aag aam aar ab- aba abb abg abm abr ag- aga agb agg agm agr ama amb amg amm amr ar- ara arb arg arm arr baa bab bag bam bar bba bbb bbg bbm bbr bga bgb bgg bgm bgr bma bmb bmg bmm bmr bra brb brg brm brr gaa gab gag gam gar gba gbg gbm gbr gga ggb ggg ggm ggr gma gmb gmg gmm gmr gra grb grg grm grr m-r maa mab mag mam mar mba mbb mbg mbm mbr mga mgb mgm mgr mma mmb mmg mmm mmr mra mrb mrg mrm mrr ra- raa rab rag ram rar rba rbb rbg rbm rbr rga rgb rgg rgr rma rmb rmg rmm rmr rra rrb rrg rrm rrr