-al a-a a-b a-t aaa aab aae aag aal aan aat ab- aba abb abe abg abl abn abt aea aeb aee aeg ael aen aet ag- aga agb age agg agl agn agt al- ala alb ale alg all aln alt an- ana anb ane ang anl ann ant at- ata atb ate atg atl atn att baa bab bae bag bal ban bat bba bbb bbe bbg bbl bbn bbt be- bea beb bee beg bel ben bet bga bgb bge bgg bgl bgn bgt bla blb ble blg bll bln blt bna bnb bne bng bnl bnn bnt bta btb bte btg btl btn btt eaa eab eae eag eal ean eat eba ebb ebe ebg ebl ebn ebt eea eeb eee eeg eel een eet ega egb ege egg egl egn egt ela elb ele elg ell eln elt en- ena enb ene eng enl enn ent eta etb ete etg etl etn ett gaa gab gae gag gal gan gat gba gbe gbg gbl gbn gbt ge- gea geb gee geg gel gen get gga ggb ggg ggn ggt gla glb gle glg gll gln glt gna gnb gne gnl gnn gnt gta gtb gte gtg gtl gtn gtt la- laa lab lae lag lal lan lat lba lbb lbe lbg lbl lbt lea leb lee leg lel len let lga lgb lge lgg lgl lgn lgt lla llb lle llg lll lln llt lna lnb lne lng lnl lnn lnt lta ltb lte ltg ltl ltt naa nab nae nag nal nan nat nba nbb nbe nbg nbl nbn nbt ne- nea neb nee neg nel nen net nga ngb nge ngg ngl ngn ngt nla nlb nle nlg nll nln nlt nna nnb nne nng nnl nnn nnt nta ntb nte ntg ntn ntt taa tab tae tag tal tan tat tba tbb tbe tbg tbl tbn tbt te- tea teb tee teg tel ten tet tga tgb tge tgg tgl tgn tgt tla tle tlg tll tln tlt tna tnb tne tng tnl tnn tnt tta ttb tte ttg ttl ttn ttt