-al -ol a-a a-b a-c aaa aab aac aak aal aao aav ab- aba abb abc abk abl abo abv ac- aca acb acc ack acl aco acv aka akb akc akk akl ako akv al- ala alb alc alk all alo alv aoa aob aoc aok aol aoo aov av- ava avb avc avk avl avo baa bab bac bak bal bao bav bba bbb bbc bbk bbl bbo bca bcb bcc bck bcl bco bcv bka bkb bkc bkk bkl bko bkv bla blb blc blk bll blo blv boa bob boc bok bol boo bov bva bvb bvc bvk bvl bvo bvv c-- caa cab cac cak cal cao cav cba cbb cbc cbk cbl cbo cbv cca ccb ccc cck ccl cco ccv cka ckb ckc cko cl- cla clb clc clk cll clo clv co- coa cob coc cok col coo cov cva cvb cvc cvk cvl cvo cvv ka- kaa kab kac kak kal kao kav kba kbb kbc kbk kbl kbo kca kcb kcc kck kcl kkb kkc kkk kkl kkv kl- kla klb klc klo klv koa kob koc kok kol koo kva kvb kvk kvo kvv la- laa lab lac lak lal lao lav lba lbb lbc lbk lbl lbo lbv lca lcb lcc lck lcl lco lcv lka lkb lkl lla llb llc llk lll llo llv loa lob loc lok lol loo lov lva lvb lvc lvl lvv oaa oab oac oak oal oao oav ob- oba obb obc obk obl obo obv oc- oca ocb occ ock ocl oco ocv oka okb okc okk okl oko ola olb olc olk oll olo oo- ooa oob ooc ook ool ooo oov ov- ova ovb ovc ovl ovo ovv v-a vaa vab vac vak val vao vav vba vbc vbk vbl vbo vbv vca vcc vcl vco vka vkb vl- vla vlb vlc vlk vll vlo vlv voa vob voc vok vol voo vov vva vvb vvc vvo vvv