-al -ol a-a a-b a-c aaa aab aac aag aak aal aao ab- aba abb abc abg abk abl abo ac- aca acb acc acg ack acl aco ag- aga agb agc agg agk agl ago aka akb akc akg akk akl ako al- ala alb alc alg alk all alo aoa aob aoc aog aok aol aoo baa bab bac bag bak bal bao bba bbb bbc bbg bbk bbl bbo bca bcb bcc bcg bck bcl bco bga bgb bgc bgg bgk bgl bgo bka bkb bkc bkg bkk bkl bko bla blb blc blg blk bll blo boa bob boc bog bok bol boo c-- caa cab cac cag cak cal cao cba cbb cbc cbg cbk cbl cbo cca ccb ccc ccg cck ccl cco cga cgb cgc cgg cgl cgo cka ckb ckc cko cl- cla clb clc clg clk cll clo co- coa cob coc cog cok col coo gaa gab gac gag gak gal gao gba gbc gbg gbk gbl gbo gca gcb gcc gcg gck gcl gco gga ggb ggc ggg ggo gka gkb gko gla glb glc glg glk gll glo goa gob goc gog gok gol goo ka- kaa kab kac kag kak kal kao kba kbb kbc kbk kbl kbo kca kcb kcc kcg kck kcl kga kgb kgc kgl kgo kkb kkc kkk kkl kl- kla klb klc klg klo koa kob koc kog kok kol koo la- laa lab lac lag lak lal lao lba lbb lbc lbg lbk lbl lbo lca lcb lcc lcg lck lcl lco lga lgb lgc lgg lgk lgl lgo lka lkb lkg lkl lla llb llc llg llk lll llo loa lob loc log lok lol loo oaa oab oac oag oak oal oao ob- oba obb obc obg obk obl obo oc- oca ocb occ ocg ock ocl oco oga ogc ogg ogl ogo oka okb okc okg okk okl oko ola olb olc olg olk oll olo oo- ooa oob ooc oog ook ool ooo