def get_new_text(self) -> str:
        """
        Return the new text added at this node compared to the parent.
        """
        if self.parent:
            parent_text = self.parent.solution_prefix
            new_text = self.solution_prefix[len(parent_text):].strip()
            return new_text
        else:
            # Root node (the question)
            return self.solution_prefix.strip()

        Return the new text added at this node compared to the parent.
        
data/omegaPRM_v2/omegaprm.py