MERGE (prev) -[:PREVIOUS_OF]-> (next)
      MERGE (next) -[:NEXT_TO]-> (prev)

      MERGE (prev) -[po:PREVIOUS_OF]-> (next)
      ON CREATE
        SET po.weight = 1.0
      ON MATCH
        SET po.weight = po.weight + 1

  def word_sentence(word) do
    res =
      Bolt.Sips.query!(
        Bolt.Sips.conn(),
        """
        MATCH (w:Word {word: $word})-[:OF_SENTENCE]-(s:Sentence)
        WITH collect(s) as sentences
        WITH apoc.coll.randomItem(sentences) as sentence
        return sentence.text as text
        """,
        %{word: word}
      )
    [text] = res["text"]
    text
  end

          NEXT_TO: {
            orientation: 'UNDIRECTED'

          PREVIOUS_OF: {
            orientation: 'UNDIRECTED',
            properties: 'weight'

          randomSeed: 42,
          relationshipWeightProperty: 'weight',