/// <summary>Subtracts argument from this box</summary>
/// <param name="second">Box to be subtracted</param>
/// <returns>Sequence of boxes resulting from subtraction</returns>
public IEnumerable <IntBox> Subtract(IntBox second)
{
throw new NotSupportedException();
}
/// <summary>Subtracts argument from this box</summary>
/// <param name="second">Box to be subtracted</param>
/// <returns>Sequence of boxes resulting from subtraction</returns>
public IEnumerable<IntBox> Subtract(IntBox second)
{
throw new NotSupportedException();
}
