text: public static ReadOnlyCollection<String> GetNotSupportedFunctionNames(){List<String> lst = new List<String>();for (int i = 0; i < functions.Length; i++){Function func = functions[i];if (func != null && (func is NotImplementedFunction)){FunctionMetadata metaData = FunctionMetadataRegistry.GetFunctionByIndex(i);lst.Add(metaData.Name);}}lst.Remove("INDIRECT"); return lst.AsReadOnly(); }