code: func FindSentencesByRelationWeight(
  	textRank *TextRank,
  	limit int,
  ) []rank.Sentence {
  
  	return rank.FindSentences(textRank.rank, rank.ByRelation, limit)
  }
docs: // FindSentencesByRelationWeight function retrieves a slice of Sentence
  // structures by TextRank object. The return value contains the ID of the
  // sentence and the sentence text itself. The slice is sorted by weight of
  // phrases from 1 to 0.