-al a-a a-b a-c aaa aab aac aag aal aan ab- aba abb abc abg abl abn ac- aca acb acc acg acl acn ag- aga agb agc agg agl agn al- ala alb alc alg all aln an- ana anb anc ang anl ann baa bab bac bag bal ban bba bbb bbc bbg bbl bbn bca bcb bcc bcg bcl bcn bga bgb bgc bgg bgl bgn bla blb blc blg bll bln bna bnb bnc bng bnl bnn c-- caa cab cac cag cal can cba cbb cbc cbg cbl cbn cca ccb ccc ccg ccl ccn cga cgb cgc cgg cgl cgn cl- cla clb clc clg cll cln cn- cna cnb cnc cng cnl cnn gaa gab gac gag gal gan gba gbc gbg gbl gbn gca gcb gcc gcg gcl gcn gga ggb ggc ggg ggn gla glb glc glg gll gln gna gnb gnc gnl gnn la- laa lab lac lag lal lan lba lbb lbc lbg lbl lca lcb lcc lcg lcl lcn lga lgb lgc lgg lgl lgn lla llb llc llg lll lln lna lnb lnc lng lnl lnn naa nab nac nag nal nan nba nbb nbc nbg nbl nbn nca ncb ncc ncg ncl ncn nga ngb ngc ngg ngl ngn nla nlb nlc nlg nll nln nna nnb nnc nng nnl nnn