a-a a-b aaa aab aae aag aam aas ab- aba abb abe abg abm abs aea aeb aee aeg aem aes ag- aga agb age agg agm ags ama amb ame amg amm ams as- asa asb ase asg asm ass baa bab bae bag bam bas bba bbb bbe bbg bbm bbs be- bea beb bee beg bem bes bga bgb bge bgg bgm bgs bma bmb bme bmg bmm bms bsa bsb bse bsg bsm bss eaa eab eae eag eam eas eba ebb ebe ebg ebm ebs eea eeb eee eeg eem ees ega egb ege egg egm egs em- ema emb eme emg emm ems es- esa esb ese esg esm ess gaa gab gae gag gam gas gba gbe gbg gbm gbs ge- gea geb gee geg gem ges gga ggb ggg ggm ggs gma gmb gme gmg gmm gms gsa gsb gse gsg gsm gss maa mab mae mag mam mas mba mbb mbe mbg mbm mbs mea meb mee meg mem mes mga mgb mge mgm mgs mma mmb mme mmg mmm mms msa msb mse msg msm mss saa sab sae sag sam sas sba sbb sbe sbg sbm sbs se- sea seb see seg sem ses sga sgb sge sgg sgm sgs sma smb sme smg smm sms ss- ssa ssb sse ssg ssm sss