def lookup_lemmatize(self, token: Token) -> List[str]:
        """Overrides parent method so that a lowercased version of the string
        is used to search the lookup table. This is necessary because our
        lookup table consists entirely of lowercase keys."""
        lookup_table = self.lookups.get_table("lemma_lookup", {})
        string = token.text.lower()
        return [lookup_table.get(string, string)]
Overrides parent method so that a lowercased version of the string
        is used to search the lookup table. This is necessary because our
        lookup table consists entirely of lowercase keys.
spacy/lang/nl/lemmatizer.py