-al a-a a-b a-c aaa aab aac aal aav ab- aba abb abc abl abv ac- aca acb acc acl acv al- ala alb alc all alv av- ava avb avc avl baa bab bac bal bav bba bbb bbc bbl bca bcb bcc bcl bcv bla blb blc bll blv bva bvb bvc bvl bvv c-- caa cab cac cal cav cba cbb cbc cbl cbv cca ccb ccc ccl ccv cl- cla clb clc cll clv cva cvb cvc cvl cvv la- laa lab lac lal lav lba lbb lbc lbl lbv lca lcb lcc lcl lcv lla llb llc lll llv lva lvb lvc lvl lvv v-a vaa vab vac val vav vba vbc vbl vbv vca vcc vcl vl- vla vlb vlc vll vlv vva vvb vvc vvv