-al a-a a-b aaa aab aae aal aan aav ab- aba abb abe abl abn abv aea aeb aee ael aen aev al- ala alb ale all aln alv an- ana anb ane anl ann anv av- ava avb ave avl avn baa bab bae bal ban bav bba bbb bbe bbl bbn be- bea beb bee bel ben bev bla blb ble bll bln blv bna bnb bne bnl bnn bnv bva bvb bve bvl bvn bvv eaa eab eae eal ean eav eba ebb ebe ebl ebn ebv eea eeb eee eel een eev ela elb ele ell eln elv en- ena enb ene enl enn env eva evb eve evl evn evv la- laa lab lae lal lan lav lba lbb lbe lbl lbv lea leb lee lel len lev lla llb lle lll lln llv lna lnb lne lnl lnn lva lvb lve lvl lvn lvv naa nab nae nal nan nav nba nbb nbe nbl nbn nbv ne- nea neb nee nel nen nev nla nlb nle nll nln nlv nna nnb nne nnl nnn nnv nva nvb nve nvl nvn nvv v-a v-e vaa vab vae val van vav vba vbl vbv vea veb vee vel ven vl- vla vlb vle vll vlv vn- vna vnl vnv vva vvb vvv