code: def cleanup_codra_edus(self):
          
          for leafpos in self.tree.treepositions('leaves'):
              edu_str = self.tree[leafpos]
  
              edu_str = EDU_START_RE.sub("", edu_str)
              edu_str = TRIPLE_ESCAPE_RE.sub('"', edu_str)
              edu_str = EDU_END_RE.sub("", edu_str)
  
              self.tree[leafpos] = edu_str
docs: Remove leading/trailing '_!' from CODRA EDUs and unescape its double quotes.