bbb bbe bbl bbn be- beb bee bel ben bev blb ble bll bln blv bnb bne bnl bnn bnv bvb bve bvl bvn bvv ebb ebe ebl ebn ebv eeb eee eel een eev elb ele ell eln elv en- enb ene enl enn env evb eve evl evn evv lbb lbe lbl lbv leb lee lel len lev llb lle lll lln llv lnb lne lnl lnn lvb lve lvl lvn lvv nbb nbe nbl nbn nbv ne- neb nee nel nen nev nlb nle nll nln nlv nnb nne nnl nnn nnv nvb nve nvl nvn nvv v-e vbl vbv veb vee vel ven vl- vlb vle vll vlv vn- vnl vnv vvb vvv