https://learn.microsoft.com/en-us/dotnet/api/system.argumentoutofrangeexception.throwifgreaterthanorequal?view=net-10.0&viewFallbackFrom=netframework-4.0
ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqualT(T, T, String) Method (System) | Microsoft...
Throws an ArgumentOutOfRangeException if value is greater than or equal to other.
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