lua= new Lua();

            List<string> good=new List<string>();
            List<object> good_obj = new List<Object>();

            lua.DoString("luanet=nil package.loaded.luanet=nil package.loaded.luanet=nil require=nil package.loadlib=nil");

            good.Add("os.time");
            good.Add("math");
            good.Add("string");

            foreach (string k in good)
            {
                Predicate<string> pred = new Predicate<string>(s => s == k); // lambda!

                good_obj[good.FindIndex(pred)]=lua[k];
            }

            foreach (DictionaryEntry ent in lua.GetTable("_G"))
            {
                lua[(string)ent.Key] = null;
            }

            foreach (string k in good)
            {
                Predicate<string> pred = new Predicate<string>(s => s == k); // lambda!
                lua[k] = good_obj[good.FindIndex(pred)];
            }
            lua["string.dump"] = null;