a-a a-b aaa aab aae aag aak aam aan ab- aba abb abe abg abk abm abn aea aeb aee aeg aek aem aen ag- aga agb age agg agk agm agn aka akb ake akg akk akm akn ama amb ame amg amk amm amn an- ana anb ane ang ank anm ann baa bab bae bag bak bam ban bba bbb bbe bbg bbk bbm bbn be- bea beb bee beg bek bem ben bga bgb bge bgg bgk bgm bgn bka bkb bke bkg bkk bkm bkn bma bmb bme bmg bmk bmm bmn bna bnb bne bng bnk bnn eaa eab eae eag eak eam ean eba ebb ebe ebg ebk ebm ebn eea eeb eee eeg eek eem een ega egb ege egg egm egn eka ekb eke ekg em- ema emb eme emg emk emm emn en- ena enb ene eng enk enm enn gaa gab gae gag gak gam gan gba gbe gbg gbk gbm gbn ge- gea geb gee geg gek gem gen gga ggb ggg ggm ggn gka gkb gkm gkn gma gmb gme gmg gmm gmn gna gnb gne gnm gnn ka- kaa kab kae kag kak kam kan kba kbb kbe kbk kbm kbn ke- kea keb kee keg kek kem ken kga kgb kgm kkb kke kkk kkm kkn kma kmb kme kmg kmk kmm kn- kna kne kng knk knm knn maa mab mae mag mak mam man mba mbb mbe mbg mbk mbm mea meb mee meg mek mem men mga mgb mge mgk mgm mgn mka mkb mke mkg mkk mkm mkn mma mmb mme mmg mmk mmm mmn mna mnb mne mng mnk mnm mnn naa nab nae nag nak nam nan nba nbb nbe nbg nbk nbm nbn ne- nea neb nee neg nek nem nen nga ngb nge ngg ngk ngm ngn nka nke nkk nkm nkn nma nmb nme nmg nmk nmm nmn nna nnb nne nng nnk nnm nnn