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Deletes this conditional format.
Use this method to remove an above-average conditional formatting rule that was previously added to a range.
void Delete()
Sub Delete()
worksheet.Range["A1:A5"].Value = new object[,] {{10}, {20}, {30}, {40}, {50}};
IAboveAverage format = worksheet.Range["A1:A5"].FormatConditions.AddAboveAverage();
format.Interior.Color = Color.Yellow;
format.Delete();