code: def locate(self, pattern):
          '''Find sequences matching a pattern. For a circular sequence, the
          search extends over the origin.
  
          :param pattern: str or NucleicAcidSequence for which to find matches.
          :type pattern: str or coral.DNA
          :returns: A list of top and bottom strand indices of matches.
          :rtype: list of lists of indices (ints)
          :raises: ValueError if the pattern is longer than either the input
                   sequence (for linear DNA) or twice as long as the input
                   sequence (for circular DNA).
  
          '''
          top_matches = self.top.locate(pattern)
          bottom_matches = self.bottom.locate(pattern)
  
          return [top_matches, bottom_matchesf locate(self, pattern):
          '''Find sequences matching a pattern. For a circular sequence, the
          search extends over the origin.
  
          :param pattern: str or NucleicAcidSequence for which to find matches.
          :type pattern: str or coral.DNA
          :returns: A list of top and bottom strand indices of matches.
          :rtype: list of lists of indices (ints)
          :raises: ValueError if the pattern is longer than either the input
                   sequence (for linear DNA) or twice as long as the input
                   sequence (for circular DNA).
  
          '''
          top_matches = self.top.locate(pattern)
          bottom_matches = self.bottom.locate(pattern)
  
          return [top_matches, bottom_matches]
docs: Find sequences matching a pattern. For a circular sequence, the
          search extends over the origin.
  
          :param pattern: str or NucleicAcidSequence for which to find matches.
          :type pattern: str or coral.DNA
          :returns: A list of top and bottom strand indices of matches.
          :rtype: list of lists of indices (ints)
          :raises: ValueError if the pattern is longer than either the input
                   sequence (for linear DNA) or twice as long as the input
                   sequence (for circular DNA).