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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def clear_document(self):
 """ Clears ALL items from document, reseting it to clean """

        self._components.clear()
        self._sequences.clear()
        self._namespaces.clear()
        self._models.clear()
        self._modules.clear()
        self._collections.clear()
        self._annotations.clear()
        self._functional_component_store.clear()
        self._collection_store.clear()