uml - Use cases Extends and include - Stack Overflow

I have a not completed diagram of e-commerce order I am not sure of the include and extend relatationship Does this diagram is correct for the attached flow

uml - can one use case be EXTENDed from more than one base use

Buffer-Overflow Attacks on Pointers.

Uml uses case diagram suggestion - Stack Overflow

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Characterizing architecture related posts and their usefulness in

uml - Can a use case be both an extension and an inclusion

Is my use case UML diagram too complicated? - Software Engineering

uml - Extend use case as base case for the include use case

Use Case Diagram Relationships Explained with Examples - Creately Blog

requirements - Are using <> and <> relationship

Simple Use Case Diagram - UML - Stack Overflow