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>
The Last Threshold The Last Threshold is a novel by R. A. Salvatore set in the Forgotten Realms campaign setting, and is the fourth book in the Neverwinter Saga. It was released on March 5, 2013. Plot summary Now that Charon's Claw is destroyed, Drizzt Do'Urden and his companions—not only Dahlia Sin'felle and Artemis Entreri, but also the former Shadovar Ambergris and Afafrenfere rest in Neverwinter while they decide their next course. Drizzt is resolved to find Guenhwyvar, who has somehow been trapped in the Shadowfell and can no longer be summoned, but when he attempts to summon her some time later, he is successful. He devises a plan to take his companions, particularly Entreri, to rebuild Port Llast in order to show them there is something worthwhile and honorable to do with their skills. While seeking the help of Arunika, Drizzt and Dahlia find evidence of a vampire, which turns out to be Thibbledorf Pwent, Bruenor Battlehammer's loyal shield dwarf who had tragically been turned into a vampire by Dor'crae. Pwent resolves to remain in the sunlight and be destroyed; Drizzt and Dahlia leave him to go in peace and honor. The group heads north. In the Shadowfell, Effron is desperate to get back at his mother, Dahlia. He plans to steal Guenhwyvar in order to blackmail Drizzt into leaving Dahlia's side, but the panther is already gone and Lord Draygo Quick discovers his plan. Meanwhile, Jarlaxle and Athrogate are alive and well and working for Bregan D'aerthe. They find out that Tiago Baenre is seeking Drizzt Do'Urden, who now apparently travels with Artemis Entreri, whom Jarlaxle had both befriended and betrayed. Jarlaxle and Athrograte travel on Bregan D'aerthe business to the Shade Enclave. Drizzt's group travel to Port Llast so that Entreri can retrieve his dagger and Drizzt can enact his plan. They help rebuild Port Llast. Drizzt notices that Guenhwyvar does not seem to be getting enough rest. That is because Draygo Quick has in fact bound her to the Shadowfell, so she is unable to return home to the Astral Plane when unsummoned. At some point, Effron appears in order to capture Dahlia, but his heart is softened and he ends up joining Drizzt's group instead. Effron tells them about Guenhwyvar. Drizzt's group go to Draygo Quick's home to retrieve Guenhwyvar. In the process, Dahlia and Entreri are petrified, Drizzt and Effron are captured, and only Ambergris escapes. Drizzt remains a guest/prisoner of Quick for as long as a year before Jarlaxle, having learned of his whereabouts from Ambergris, mounts an assault by Bregan D'aerthe on Quick's residence. Drizzt and his companions are freed and unpetrified. They set forth for Icewind Dale, determined to wait out Tiago's search. In Icewind Dale, the group inadvertently wander into a portion of Iruladoon, spending a night there that lasts eighteen years. When they awake, it is 1484 DR and it seems the world has forgotten them. Drizzt resolves to stay in Icewind Dale and Dahlia, upset with him, attacks him. Entreri pulls Dahlia away, but not before Drizzt appears to succumb to his wounds on top of Kelvin's Cairn, hearing the voices of his long-dead friends beside him. Characters Main characters Drizzt Do'Urden Dahlia Sin'felle Artemis Entreri Supporting characters Afafrenfere, monk Ambergris, dwarf Draygo Quick, Netherese lord Effron, tiefling and Dahlia's son Parise Ulfbinder, Netherese lord Tiago Baenre, drow warrior 'Jarlaxle, leader of Bregan D'aerthe Kimmuriel Oblodra, leader of Bregan D'aerthe Minor characters Andray Cannavara, captain of the Minnow Skipper Arunika, succubus Beniago, High Captain of Ship Kurth Byok, Tiago's riding lizard Druzil, imp Erlindir, druid of Mielikki Errtu,
</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.