-er bbb bbe bbl bbn bbr be- beb bee bel ben ber bev blb ble bll bln blr blv bnb bne bnl bnn bnr bnv brb bre brl brn brr brv bvb bve bvl bvn bvr bvv ebb ebe ebl ebn ebr ebv eeb eee eel een eer eev elb ele ell eln elr elv en- enb ene enl enn enr env erb ere erl ern err erv evb eve evl evn evr evv lbb lbe lbl lbr lbv leb lee lel len ler lev llb lle lll lln llr llv lnb lne lnl lnn lnr lrb lrn lrr lrv lvb lve lvl lvn lvr lvv nbb nbe nbl nbn nbr nbv ne- neb nee nel nen ner nev nlb nle nll nln nlr nlv nnb nne nnl nnn nnv nrb nre nrl nrn nrr nrv nvb nve nvl nvn nvv rbb rbe rbl rbn rbr re- reb ree rel ren rer rev rle rll rln rlr rnb rnn rnr rnv rrb rrl rrn rrr rvb rve rvl rvn rvr rvv v-e vbl vbr vbv veb vee vel ven ver vl- vlb vle vll vlv vn- vnl vnr vnv vrb vre vrn vrr vvb vvr vvv