a-a a-b aaa aab aag aam aas ab- aba abb abg abm abs ag- aga agb agg agm ags ama amb amg amm ams as- asa asb asg asm ass baa bab bag bam bas bba bbb bbg bbm bbs bga bgb bgg bgm bgs bma bmb bmg bmm bms bsa bsb bsg bsm bss gaa gab gag gam gas gba gbg gbm gbs gga ggb ggg ggm ggs gma gmb gmg gmm gms gsa gsb gsg gsm gss maa mab mag mam mas mba mbb mbg mbm mbs mga mgb mgm mgs mma mmb mmg mmm mms msa msb msg msm mss saa sab sag sam sas sba sbb sbg sbm sbs sga sgb sgg sgm sgs sma smb smg smm sms ss- ssa ssb ssg ssm sss