-al a-a a-b a-c aaa aab aac aae aag aal aan ab- aba abb abc abe abg abl abn ac- aca acb acc ace acg acl acn aea aeb aec aee aeg ael aen ag- aga agb agc age agg agl agn al- ala alb alc ale alg all aln an- ana anb anc ane ang anl ann baa bab bac bae bag bal ban bba bbb bbc bbe bbg bbl bbn bca bcb bcc bce bcg bcl bcn be- bea beb bec bee beg bel ben bga bgb bgc bge bgg bgl bgn bla blb blc ble blg bll bln bna bnb bnc bne bng bnl bnn c-- caa cab cac cae cag cal can cba cbb cbc cbe cbg cbl cbn cca ccb ccc cce ccg ccl ccn ce- cea ceb cec cee ceg cel cen cga cgb cgc cge cgg cgl cgn cl- cla clb clc cle clg cll cln cn- cna cnb cnc cne cng cnl cnn eaa eab eac eae eag eal ean eba ebb ebc ebe ebg ebl ebn ec- eca ecb ecc ece ecg ecl ecn eea eeb eec eee eeg eel een ega egb egc ege egg egl egn ela elb elc ele elg ell eln en- ena enb enc ene eng enl enn gaa gab gac gae gag gal gan gba gbc gbe gbg gbl gbn gca gcb gcc gce gcg gcl gcn ge- gea geb gec gee geg gel gen gga ggb ggc ggg ggn gla glb glc gle glg gll gln gna gnb gnc gne gnl gnn la- laa lab lac lae lag lal lan lba lbb lbc lbe lbg lbl lca lcb lcc lce lcg lcl lcn lea leb lec lee leg lel len lga lgb lgc lge lgg lgl lgn lla llb llc lle llg lll lln lna lnb lnc lne lng lnl lnn naa nab nac nae nag nal nan nba nbb nbc nbe nbg nbl nbn nca ncb ncc nce ncg ncl ncn ne- nea neb nec nee neg nel nen nga ngb ngc nge ngg ngl ngn nla nlb nlc nle nlg nll nln nna nnb nnc nne nng nnl nnn