original_docstring: find the root of the key
  
          Args:
              key: a token
  
          Returns: 
              the root of the key
  
          
docstring: find the root of the key
docstring_tokens: find the root of the key
code: def find(self, key: str):
          """find the root of the key
  
          Args:
              key: a token
  
          Returns: 
              the root of the key
  
          """
  
          if key not in self.link_union:
              return None
  
          if self.link_union[key] != key:
              return self.find(self.link_union[key])
          return self.link_union[key]
code_tokens: def find ( self , key : str ) : if key not in self . link_union : return None if self . link_union [ key ] != key : return self . find ( self . link_union [ key ] ) return self . link_union [ key ]
short_docstring: find the root of the key
short_docstring_tokens: find the root of the key
comment: """find the root of the key
  
          Args:
              key: a token
  
          Returns: 
              the root of the key
  
          """