a-a a-b a-t aaa aab aae aag aak aam aan aat ab- aba abb abe abg abk abm abn abt aea aeb aee aeg aek aem aen aet ag- aga agb age agg agk agm agn agt aka akb ake akg akk akm akn ama amb ame amg amk amm amn amt an- ana anb ane ang ank anm ann ant at- ata atb ate atg atm atn att baa bab bae bag bak bam ban bat bba bbb bbe bbg bbk bbm bbn bbt be- bea beb bee beg bek bem ben bet bga bgb bge bgg bgk bgm bgn bgt bka bkb bke bkg bkk bkm bkn bkt bma bmb bme bmg bmk bmm bmn bmt bna bnb bne bng bnk bnn bnt bta btb bte btg btk btm btn btt eaa eab eae eag eak eam ean eat eba ebb ebe ebg ebk ebm ebn ebt eea eeb eee eeg eek eem een eet ega egb ege egg egm egn egt eka ekb eke ekg ekt em- ema emb eme emg emk emm emn emt en- ena enb ene eng enk enm enn ent eta etb ete etg etk etm etn ett gaa gab gae gag gak gam gan gat gba gbe gbg gbk gbm gbn gbt ge- gea geb gee geg gek gem gen get gga ggb ggg ggm ggn ggt gka gkb gkm gkn gkt gma gmb gme gmg gmm gmn gmt gna gnb gne gnm gnn gnt gta gtb gte gtg gtk gtm gtn gtt k-t ka- kaa kab kae kag kak kam kan kat kba kbb kbe kbk kbm kbn ke- kea keb kee keg kek kem ken ket kga kgb kgm kkb kke kkk kkm kkn kkt kma kmb kme kmg kmk kmm kmt kn- kna kne kng knk knm knn knt kta ktb kte ktg ktk ktm ktn ktt maa mab mae mag mak mam man mat mba mbb mbe mbg mbk mbm mbt mea meb mee meg mek mem men met mga mgb mge mgk mgm mgn mgt mka mkb mke mkg mkk mkm mkn mkt mma mmb mme mmg mmk mmm mmn mmt mna mnb mne mng mnk mnm mnn mnt mta mtb mte mtg mtk mtm mtn mtt naa nab nae nag nak nam nan nat nba nbb nbe nbg nbk nbm nbn nbt ne- nea neb nee neg nek nem nen net nga ngb nge ngg ngk ngm ngn ngt nka nke nkk nkm nkn nkt nma nmb nme nmg nmk nmm nmn nmt nna nnb nne nng nnk nnm nnn nnt nta ntb nte ntg ntk ntm ntn ntt taa tab tae tag tak tam tan tat tba tbb tbe tbg tbk tbm tbn tbt te- tea teb tee teg tek tem ten tet tga tgb tge tgg tgk tgm tgn tgt tka tkb tke tkg tkk tkm tkt tma tmb tme tmg tmk tmm tmn tmt tna tnb tne tng tnk tnm tnn tnt tta ttb tte ttg ttk ttm ttn ttt