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>
Kraken (Marvel Comics) Kraken is a name or title shared among several characters in Marvel Comics. While the original Kraken is the creature of the same name, the rest have been people who have used the name as their persona. The creature and one of the characters has appeared in other media. Publication history The first Kraken made multiple appearances in Marvel continuity, including The Avengers #27 (April 1966, Marvel Comics), Tales to Astonish #93 and Sub-Mariner #27 (July 1970), before returning years later in the second issue of the limited series Fallen Son: The Death of Captain America (#1 - 5, June-Aug. 2007)., and in The New Invaders #4 from April 2014. A Kraken appeared in the short story "When Strikes The Kraken!" in Kull The Destroyer #17 (Oct. 1976), and was reprinted in Chronicles of Kull 2: The Hell Beneath Atlantis and Other Stories. Another Kraken (a gigantic squid) debuted in the black and white Bizarre Adventures #26 (May 1981). A creature called The Black Kraken debuted in the short story "Red Shadows and Black Kraken!" (based on the 1968 fantasy novel Conan of the Isles written by L. Sprague de Camp and Lin Carter featuring Robert E. Howard's hero Conan the Barbarian. The story is republished in the graphic novel Conan of the Isles.) in Conan The Barbarian Annual #7 (1982). Another version of the Kraken (four-armed and reptilian in appearance) debuted in Marvel Comics Presents #121 (Jan. 1993). It returned in Marvel Action Hour featuring the Fantastic Four #2-4 (Dec. 1994-Feb. 1995) and in the one shot title Namora #1 (Aug. 2010); it would later be featured in the video game Marvel Ultimate Alliance. A Kraken (a horned squid creature) appeared in the 2009 one-shot comic Sub-Mariner Comics: 70th Anniversary Special., while another (a house sized crab/octopus hybrid) appeared in Fantomex Max issues #2 and #3. This Kraken was modified into a remote controlled cyborg to protect an underwater base of a brilliant scientist. Another Kraken (serpent-like in appearance) appeared in Jean-Grey #3. in 2017. Two additional versions possessed ties to Greek mythology. The first served the Olympian Gods and debuted in the one shot Chaos War: God Squad #1 (Feb. 2011) before returning in Incredible Hulk #622 (April 2011). The second Kraken appeared in the four-part limited series Wolverine/Hercules: Myths, Monsters & Mutants. Spirited away by the god Poseidon after a defeat by Greek hero Perseus, the creature is revived in modern times by King Eurystheus to battle the heroes Hercules and Wolverine. Fictional character biography Sea monsters The original Kraken is based on the mythical creature of the same name. Within the Marvel Universe, it is established that the creature can be called upon through the use of the Proteus Horn. During the Hyborian Age following the Great Cataclysm, one black Kraken lurked near the Barachan Islands. Sailing nearby while investigating the massive kidnappings, Conan the Barbarian was attacked by the Black Kraken. Conan was able to use his axe to slash one of the Black Kraken's eyes which caused it to drop Conan. The Black Kraken's other eye is then slashed by Conan enough to blind it as it disappears underwater. The creature has been called upon by Commander Kraken to fight Namor on one occasion. The creature at one point went up against Wolverine and Hercules. Daniel Whitehall Daniel Whitehall is a British Intelligence agent who was part of The Great Wheel of the Zodiac, collaborating with other major agents such as Nick Fury, Dum Dum Dugan and Baron Strucker. They were later betrayed by two other agents Viktor Uvarov and Vasili
</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.