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1. Api.cs Api.cs

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   using System;

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   using System.IO;

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   using System.Net;

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   using System.Web;

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   using System.Linq;

2. ExtensionForLinq.cs ExtensionForLinq.cs

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   using System;

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   using System.Collections.Generic;

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   using System.Linq;

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   namespace ConsoleApp2