code: func FindPhrases(ranks *Rank) []Phrase {
  	var phrases []Phrase
  
  	for x, xMap := range ranks.Relation.Node {
  		for y := range xMap {
  			phrases = append(phrases, Phrase{
  				ranks.Words[x].ID,
  				ranks.Words[y].ID,
  				ranks.Words[x].Token,
  				ranks.Words[y].Token,
  				ranks.Relation.Node[x][y].Weight,
  				ranks.Relation.Node[x][y].Qty,
  			})
  		}
  	}
  
  	sort.Slice(phrases, func(i, j int) bool {
  		return phrases[i].Weight > phrases[j].Weight
  	})
  
  	return phrases
  }
docs: // FindPhrases function has wrapper textrank.FindPhrases. Use the wrapper
  // instead.