a-a a-b aaa aab aae aag aam aan aas ab- aba abb abe abg abm abn abs aea aeb aee aeg aem aen aes ag- aga agb age agg agm agn ags ama amb ame amg amm amn ams an- ana anb ane ang anm ann ans as- asa asb ase asg asm asn ass baa bab bae bag bam ban bas bba bbb bbe bbg bbm bbn bbs be- bea beb bee beg bem ben bes bga bgb bge bgg bgm bgn bgs bma bmb bme bmg bmm bmn bms bna bnb bne bng bnn bns bsa bsb bse bsg bsm bsn bss eaa eab eae eag eam ean eas eba ebb ebe ebg ebm ebn ebs eea eeb eee eeg eem een ees ega egb ege egg egm egn egs em- ema emb eme emg emm emn ems en- ena enb ene eng enm enn ens es- esa esb ese esg esm esn ess gaa gab gae gag gam gan gas gba gbe gbg gbm gbn gbs ge- gea geb gee geg gem gen ges gga ggb ggg ggm ggn ggs gma gmb gme gmg gmm gmn gms gna gnb gne gnm gnn gns gsa gsb gse gsg gsm gsn gss maa mab mae mag mam man mas mba mbb mbe mbg mbm mbs mea meb mee meg mem men mes mga mgb mge mgm mgn mgs mma mmb mme mmg mmm mmn mms mna mnb mne mng mnm mnn mns msa msb mse msg msm msn mss naa nab nae nag nam nan nas nba nbb nbe nbg nbm nbn nbs ne- nea neb nee neg nem nen nes nga ngb nge ngg ngm ngn ngs nma nmb nme nmg nmm nmn nms nna nnb nne nng nnm nnn nns nsa nsb nse nsg nsm nsn nss saa sab sae sag sam san sas sba sbb sbe sbg sbm sbn sbs se- sea seb see seg sem sen ses sga sgb sge sgg sgm sgn sgs sma smb sme smg smm smn sms sna snb sne sng snm snn sns ss- ssa ssb sse ssg ssm ssn sss