What is the reason for defining multiple identical interfaces on an inheritance system in .NET?

the definition of non-generic IList interface in the official .NET documentation is: 

public interface IList : ICollection

there are a lot of phenomena like repeatedly inheriting the same interface in .NET Framework BCL, so why design it this way? What kind of thinking is it based on?

Inherit-the interface c-sharp- .-Net
Mar.06,2021

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