a-a a-b a-t aaa aab aag aam aar aat ab- aba abb abg abm abr abt ag- aga agb agg agm agr agt ama amb amg amm amr amt ar- ara arb arg arm arr art at- ata atb atg atm atr att baa bab bag bam bar bat bba bbb bbg bbm bbr bbt bga bgb bgg bgm bgr bgt bma bmb bmg bmm bmr bmt bra brb brg brm brr brt bta btb btg btm btr btt gaa gab gag gam gar gat gba gbg gbm gbr gbt gga ggb ggg ggm ggr ggt gma gmb gmg gmm gmr gmt gra grb grg grm grr grt gta gtb gtg gtm gtr gtt m-r maa mab mag mam mar mat mba mbb mbg mbm mbr mbt mga mgb mgm mgr mgt mma mmb mmg mmm mmr mmt mra mrb mrg mrm mrr mrt mta mtb mtg mtm mtr mtt ra- raa rab rag ram rar rat rba rbb rbg rbm rbr rbt rga rgb rgg rgr rgt rma rmb rmg rmm rmr rmt rra rrb rrg rrm rrr rrt rta rtb rtg rtm rtr rtt taa tab tag tam tar tat tba tbb tbg tbm tbr tbt tga tgb tgg tgm tgr tgt tma tmb tmg tmm tmr tmt tra trb trg trm trr trt tta ttb ttg ttm ttr ttt