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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.prepend?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.sequenceequal?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.single?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.firstordefault?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.longcount?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.min?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.cast?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.concat?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.contains?view=netframework-4.7.2
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https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.singleordefault?view=netframework-4.7.2