a-a a-b aaa aab aag aak aam ab- aba abb abg abk abm ag- aga agb agg agk agm aka akb akg akk akm ama amb amg amk amm baa bab bag bak bam bba bbb bbg bbk bbm bga bgb bgg bgk bgm bka bkb bkg bkk bkm bma bmb bmg bmk bmm gaa gab gag gak gam gba gbg gbk gbm gga ggb ggg ggm gka gkb gkm gma gmb gmg gmm ka- kaa kab kag kak kam kba kbb kbk kbm kga kgb kgm kkb kkk kkm kma kmb kmg kmk kmm maa mab mag mak mam mba mbb mbg mbk mbm mga mgb mgk mgm mka mkb mkg mkk mkm mma mmb mmg mmk mmm