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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 _init_study_items_max(self):
 """User can limit the number of genes printed in a GO term."""

        if self.study_items is None:
            return None
        if self.study_items is True:
            return None
        if isinstance(self.study_items, int):
            return self.study_items
        return None