Use Case - Difference between Include and Extend Notation

I see people always struggling with include/exclude notation inside use case diagrams. I think these diagrams could explain it better. use case diagram include…

Table 1 from An extension of the use case diagram to model context-aware applications

Use Case Diagram - Extend Notation

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Use Case Relationships

What is Use Case Relationship? Include, Extend, Generalization - Binary Terms

UML use case extend relationship is used to show how and when some optional extending use case can be inserted into extended (base) use case.

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Informal Semantics for UML Use Case Diagrams

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requirements - Are using <> and <> relationship in this use -case diagram actually same? - Software Engineering Stack Exchange

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Extend and include in the UML use case diagram

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Use Case - Difference between Include and Extend Notation

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