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what does " concrete implementations of the dependencies" means?

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A concrete implementation of dependency means programming against a concrete class instead of interface. So the dependency classes are more tightly coupled. So should consider use interface to avoid this coupling.

A good read for Dependency injection and inversion of control

An Absolute Beginner's Tutorial on Dependency Inversion Principle, Inversion of Control and Dependency Injection[^]

Hope this helps...
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