-al -ol a-a a-b a-c aaa aab aac aag aal aao ab- aba abb abc abg abl abo ac- aca acb acc acg acl aco ag- aga agb agc agg agl ago al- ala alb alc alg all alo aoa aob aoc aog aol aoo baa bab bac bag bal bao bba bbb bbc bbg bbl bbo bca bcb bcc bcg bcl bco bga bgb bgc bgg bgl bgo bla blb blc blg bll blo boa bob boc bog bol boo c-- caa cab cac cag cal cao cba cbb cbc cbg cbl cbo cca ccb ccc ccg ccl cco cga cgb cgc cgg cgl cgo cl- cla clb clc clg cll clo co- coa cob coc cog col coo gaa gab gac gag gal gao gba gbc gbg gbl gbo gca gcb gcc gcg gcl gco gga ggb ggc ggg ggo gla glb glc glg gll glo goa gob goc gog gol goo la- laa lab lac lag lal lao lba lbb lbc lbg lbl lbo lca lcb lcc lcg lcl lco lga lgb lgc lgg lgl lgo lla llb llc llg lll llo loa lob loc log lol loo oaa oab oac oag oal oao ob- oba obb obc obg obl obo oc- oca ocb occ ocg ocl oco oga ogc ogg ogl ogo ola olb olc olg oll olo oo- ooa oob ooc oog ool ooo