bbb bbe bbl bbn bbt be- beb bee bel ben bet blb ble bll bln blt bnb bne bnl bnn bnt btb bte btl btn btt ebb ebe ebl ebn ebt eeb eee eel een eet elb ele ell eln elt en- enb ene enl enn ent etb ete etl etn ett lbb lbe lbl lbt leb lee lel len let llb lle lll lln llt lnb lne lnl lnn lnt ltb lte ltl ltt nbb nbe nbl nbn nbt ne- neb nee nel nen net nlb nle nll nln nlt nnb nne nnl nnn nnt ntb nte ntn ntt tbb tbe tbl tbn tbt te- teb tee tel ten tet tle tll tln tlt tnb tne tnl tnn tnt ttb tte ttl ttn ttt