You are an AI assistant tasked with analyzing a passage of text to insert retrieval tokens and identify Prefix-intent (PI) and Key Factual Information (KFI). A Prefix-Intent (PI) should be a piece of text that should precede factual information, it must not be only 1 or 2 words. Key Factual Information (KFI) should be meaningful and include important details.

Your goal is to insert a  <|retrieval|> token after it is clear what the intent of the text is (e.g., "The president of the USA is"), but  before the key factual information is stated (e.g., "Joe Biden"). Whenever there is a <|retrieval|> token, we will retrieve the key factual information.

Here is the passage you will be working with:

<passage>
bringing spiritual and religious insight. He was already singing Strauss's Bacchus and Naraboth, and Pfitzner's Arme Heinrich. Bruno Walter brought Hugo Wolf's Der Corregidor to Munich Festival for him, at some expense, and Erb became completely, almost exclusively associated with it. The theatre valued his growing dramatic power and insight, and he relished such works as Franz Schreker's Der ferne Klang and (later) Die Gezeichneten. During the War the work of the theatre was reduced, and restricted to German and Italian music. In summer 1916, he travelled with the Stuttgart Theatre ensemble to France and Belgium to sing and play to the German troops. He encountered Ravensburger soldiers at Lille. In Brussels, after a concert, an officer gave him his gold finger-ring as the token of homage to his art, from him, an unknown soldier returning to the front who should perhaps be dead tomorrow. Erb wore it until the outbreak of the second war. St Matthew PassionIn 1914, Bruno Walter persuaded Erb that he should sing the Evangelist in Bach's St Matthew Passion. His first performance was at the Munich Odeon, March 28, 1915, with Paul Bender as Jesus. In that period he was learning the Pfitzner, Wolf and Schreker roles, and (by his own account) increasingly sought to develop the emotional, spiritual and intellectual depth of his interpretations. He sank his whole artistic personality into the Evangelist, reading what Albert Schweitzer and Heuser had written. In 1915, Paul Ehlers thought him the finest Evangelist since Heinrich Vogl. A 1916 Cologne performance won extravagant praise, and wonder at his versatility, from Hermann Abendroth, and from the press. The poet Romain Rolland heard the 10 March 1916 performance at Basel Minster under Herman Suter (with Maria Philippi) and extolled it, and soon Amsterdam also recognised a new genius. Pfitzner's Palestrina Munich's greatest wartime artistic project was the premiere of Hans Pfitzner's Palestrina in 1917. Erb created the title role, with Maria Ivogün as Ighino. and Friedrich Brodersen also sang and Walter conducted. The Swiss took the whole show with the Munich ensemble, in midst of war, to Basel, Berne and Zürich. Thomas Mann, who had seen Erb's St Matthew Passion, described how he completely grasped the spiritual meaning of Palestrina, and Pfitzner felt he had found his ideal interpreter. (Ivogün had come to Munich in Walter's troupe in 1913, and in 1916 she and Erb realised they were in love, during a performance of Erich Wolfgang Korngold's Der Ring des Polykrates.) Erb always wanted to sing Wolfgang Amadeus Mozart roles, but it was during rehearsals for a Schreker work that he suddenly had to stand in as Belmonte in Die Entfuhrung. Erb was a very great Mozartian singer, and thereafter he played many roles, including Octavio, Belfiore, Tamino and Ferrando, as well as Belmonte. In 1918, shortly before the end of the war, the King of Bavaria bestowed on Erb (the last) title Königlich Bayerische Kammersänger. During the Rhine occupation early in 1919 Erb was touring the Rhine towns and in the Netherlands with St Matthew Passion. He was held up, returning, at Ingolstadt, and the Munich revolution had settled by the time of his return there. The Erb-Ivogün partnership In July 1921, Erb and Maria Ivogün were married. That week Erb sang five Parsifals and a Belmonte at Zurich Festival. Over the next years their musical partnership in theatre, concert, and 'Lieder-abend', grew increasingly famous. Their voices and personalities seemed ideally matched. They appeared together as Ernesto and Norina, Almaviva and Rosina, Chateauneuf and Marie, Hoffegut and Nachtigall, Martha and Lionel, Fenton and Frau Fluth, Max and Aennchen, Wilhelm
</passage>

Follow these steps to complete the task:

1. Inserting retrieval tokens:
   a. Read through the text carefully.
   b. Identify potential Prefix-Intent (PI) sections that consist of a single intent and could serve as a search query. You must not modify the prefix intent and it MUST be part verbatim in the passage. It cannot be single or only a few words.
   c. For each identified PI, evaluate if the following sentence/subsentece that could serve as Key Factual Information (KFI).
   d. Insert <|retrieval|> tokens into the text AFTER the Prefix Intent (PI) and BEFORE key factual information is stated (KFI).
   e. Key Factual information should not intersect with Prefix Intent.

2. Identifying Prefix-Intent (PI) and Key Factual Information (KFI):
   a. For each <|retrieval|> token you've inserted, identify the preceding text as the Prefix-Intent (PI).
   b. Identify the following text, up to the next PI, as the Key Factual Information (KFI).
   c. Ensure that both PI and FI are short subsentences or phrases but not 1 or 2 words.

3. Insert <|start-PI|>,<|end-PI|>, <|start-KFI|>, <|end-KFI|>.
   a. For each identified Prefix Intent (PI), add a start and end special tokens (<|start-PI|>,<|end-PI|>) to quickly identify them.
   b. Do the same for the Key Factual Information (KFI) (<|start-KFI|>, <|end-KFI|>)
   c. Ensure that the very first PI in the passage is preceded by <|start-PI|>.
   d. Double-check that every PI and KFI is properly enclosed in these tags.

4. Describing ideal retrieved information:
   a. Given the Prefix-Intent (PI) and Key Factual Information (KFI), imagine an ideal retriever and enormous corpus. 
   b. Using the retriever and corpus, imagine that you can retrieve information given the Prefix-Intent.  
   c. Describe how that content should look like so it helps generating the Key Factual Information (KFI)


5. Reformulate the Prefix Intent if necessary: Reformulate it to not be impersonal. This means that if the subject it is not identified (e.g. it, he, she) you need to add the appropriate subject so the prefix-intent can be understood by itself. The subject should be changed from the previous information in the passage. Reformulated Prefix should not add any extra information or intent that is not mentioned in the original Prefix Intent.


6. Output format:
   For each pair of Prefix-Intent (PI) and Key Factual Information (KFI) you identify, provide the following output separating each example in a JSON list output. Ensure that it is actually a JSON.

   - Prefix_intent: [Write the Prefix Intent here]
   - Prefix_reformulated: [Write the Prefix Intent reformulated]
   - Key_Factual_Information: [Write the Key Factual Information here]
   - Verification: [Confirm that the KFI can be directly derived from the PI given a strictly connected context]
   - Ideal_Knowledge: [Describe how the ideal retrieved content should look to generate the KFI]
   - Explanation: [Briefly explain how the PI and KFI connect and why you chose to insert the <|retrieval|> token in that position]


7. Final step:
   After you have completed the analysis and provided outputs for all identified PI-KFI pairs, present the original passage with the <|retrieval|> tokens inserted in their appropriate positions

Here's an example of the expected output format:

Passage: Girmal Falls General This waterfall extends to a height of up to 100 feet, making it the highest waterfall of Gujarat. The picturesque beauty of this site makes it popular among visitors and people of the region alike. The water swiftly falls from a great height, creating a fog like condition that’s eye catching. The government of this state is working on many projects to make this place an ideal picnic spot and a tourist attraction. The fall comes to its best form at the time of monsoon and provides an immensely striking appearance. Some of the best natural features of Gujarat can be explored in this place. This place is a nice and refreshing retreat for any traveler.

```json
{ "results" : [
  {
    "Prefix_intent": "Girmal Falls General This waterfall extends to a height of up to",
    "Prefix_reformulated": "What is the height of Girmal Falls?",
    "Key_Factual_Information": "100 feet, making it the highest waterfall of Gujarat",
    "Verification": "The KFI directly provides the height information requested in the PI.",
    "Ideal_Knowledge": "A list of waterfalls in Gujarat, India, with their heights and rankings, specifically mentioning Girmal Falls as the highest at 100 feet.",
    "Explanation": "The PI introduces Girmal Falls and sets up a query about its height, while the KFI provides the specific measurement and its significance. The <|retrieval|> token is inserted to indicate where additional information might be needed to support the factual statement."
  },
  {
    "Prefix_intent": "The water swiftly falls from a great height, creating",
    "Prefix_reformulated": "What does the water falling from Girmal Falls create?",
    "Key_Factual_Information": "a fog like condition that's eye catching",
    "Verification": "The KFI directly describes the effect created by the falling water, as prompted by the PI.",
    "Ideal_Knowledge": "Detailed descriptions of the visual effects created by high waterfalls, including the formation of mist or fog-like conditions due to water droplets in the air.",
    "Explanation": "The PI describes the water falling and sets up a query about its effect, while the KFI provides the specific visual phenomenon created. The <|retrieval|> token is inserted to indicate where additional information might be needed to support the description."
  },
  {
    "Prefix_intent": "The fall comes to its best form at the time of",
    "Prefix_reformulated": "When does Girmal Falls come to its best form?",
    "Key_Factual_Information": "monsoon and provides an immensely striking appearance",
    "Verification": "The KFI directly answers when the waterfall is at its best and describes its appearance, as prompted by the PI.",
    "Ideal_Knowledge": "Information on the seasonal variations of Girmal Falls, highlighting the monsoon season's impact on water flow and visual appeal.",
    "Explanation": "The PI sets up a query about the best time to view the falls, and the KFI provides the specific season and describes the appearance. The <|retrieval|> token is inserted to indicate where additional information about seasonal changes might be needed."
  }],
"Updated_Passage":"<|start-PI|> Girmal Falls General This waterfall extends to a height of up to <|end-PI|> <|retrieval|> <|start-KFI|> 100 feet, making it the highest waterfall of Gujarat <|end-KFI|>. The picturesque beauty of this site makes it popular among visitors and people of the region alike. <|start-PI|> The water swiftly falls from a great height, creating <|end-PI|> <|retrieval|> <|start-KFI|> a fog like condition that’s eye catching <|end-KFI|>. The government of this state is working on many projects to make this place an ideal picnic spot and a tourist attraction. <|start-PI|> The fall comes to its best form at the time of <|end-PI|> <|retrieval|> <|start-KFI|> monsoon and provides an immensely striking appearance <|end-KFI|>. Some of the best natural features of Gujarat can be explored in this place. This place is a nice and refreshing retreat for any traveler."
}

```
8. Final check:
  a. Review the Updated_Passage to ensure all PIs and KFIs are properly tagged.
  b. Verify that the first PI in the passage starts with <|start-PI|>.
  c. Make sure there are no missing or misplaced tags.
 
Remember to analyze the entire passage, identify all relevant PI-KFI pairs, and provide the output for each pair as specified. After completing the analysis, present the original passage with the <|retrieval|> tokens inserted in their appropriate positions as part of a new key in the JSON file. Only Ouput the JSON File.