a-a a-b a-c aaa aab aac aae aag aam aan ab- aba abb abc abe abg abm abn ac- aca acb acc ace acg acm acn aea aeb aec aee aeg aem aen ag- aga agb agc age agg agm agn ama amb amc ame amg amm amn an- ana anb anc ane ang anm ann baa bab bac bae bag bam ban bba bbb bbc bbe bbg bbm bbn bca bcb bcc bce bcg bcm bcn be- bea beb bec bee beg bem ben bga bgb bgc bge bgg bgm bgn bma bmb bmc bme bmg bmm bmn bna bnb bnc bne bng bnn c-- caa cab cac cae cag cam can cba cbb cbc cbe cbg cbm cbn cca ccb ccc cce ccg ccm ccn ce- cea ceb cec cee ceg cem cen cga cgb cgc cge cgg cgm cgn cma cmb cmc cme cmg cmm cmn cn- cna cnb cnc cne cng cnm cnn eaa eab eac eae eag eam ean eba ebb ebc ebe ebg ebm ebn ec- eca ecb ecc ece ecg ecm ecn eea eeb eec eee eeg eem een ega egb egc ege egg egm egn em- ema emb emc eme emg emm emn en- ena enb enc ene eng enm enn gaa gab gac gae gag gam gan gba gbc gbe gbg gbm gbn gca gcb gcc gce gcg gcm gcn ge- gea geb gec gee geg gem gen gga ggb ggc ggg ggm ggn gma gmb gmc gme gmg gmm gmn gna gnb gnc gne gnm gnn maa mab mac mae mag mam man mba mbb mbc mbe mbg mbm mc- mca mcb mcc mce mcg mcm mcn mea meb mec mee meg mem men mga mgb mgc mge mgm mgn mma mmb mmc mme mmg mmm mmn mna mnb mnc mne mng mnm mnn naa nab nac nae nag nam nan nba nbb nbc nbe nbg nbm nbn nca ncb ncc nce ncg ncm ncn ne- nea neb nec nee neg nem nen nga ngb ngc nge ngg ngm ngn nma nmb nmc nme nmg nmm nmn nna nnb nnc nne nng nnm nnn