| 123456789101112131415161718 | from abc import ABC, abstractmethodclass RecommendAppRetrievalBase(ABC):    """Interface for recommend app retrieval."""    @abstractmethod    def get_recommended_apps_and_categories(self, language: str) -> dict:        raise NotImplementedError    @abstractmethod    def get_recommend_app_detail(self, app_id: str):        raise NotImplementedError    @abstractmethod    def get_type(self) -> str:        raise NotImplementedError
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