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Note that the solid arrows represent compile-time dependencies, while the dashed arrow represents a runtime-only dependency. Using the clean architecture, the UI layer works with interfaces defined in the Application Core at compile time, and ideally should not have any knowledge of the implementation types defined in the Infrastructure layer. At runtime, however, these implementation types will be required for the app to execute, so they will need to be present and wired up to the Application Core interfaces via dependency injection.