-al a-a a-b a-c aaa aab aac aae aag aal ab- aba abb abc abe abg abl ac- aca acb acc ace acg acl aea aeb aec aee aeg ael ag- aga agb agc age agg agl al- ala alb alc ale alg all baa bab bac bae bag bal bba bbb bbc bbe bbg bbl bca bcb bcc bce bcg bcl be- bea beb bec bee beg bel bga bgb bgc bge bgg bgl bla blb blc ble blg bll c-- caa cab cac cae cag cal cba cbb cbc cbe cbg cbl cca ccb ccc cce ccg ccl ce- cea ceb cec cee ceg cel cga cgb cgc cge cgg cgl cl- cla clb clc cle clg cll eaa eab eac eae eag eal eba ebb ebc ebe ebg ebl ec- eca ecb ecc ece ecg ecl eea eeb eec eee eeg eel ega egb egc ege egg egl ela elb elc ele elg ell gaa gab gac gae gag gal gba gbc gbe gbg gbl gca gcb gcc gce gcg gcl ge- gea geb gec gee geg gel gga ggb ggc ggg gla glb glc gle glg gll la- laa lab lac lae lag lal lba lbb lbc lbe lbg lbl lca lcb lcc lce lcg lcl lea leb lec lee leg lel lga lgb lgc lge lgg lgl lla llb llc lle llg lll