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>
Mexican Federal Highway 24 Federal Highway 24 (, Fed. 24) is a free part of the federal highways corridors (). Fed. 24 is intended to cross the Sierra Madre Occidental from the area of Hidalgo del Parral, Chihuahua, on the east, to the area of Culiacán, Sinaloa, on the west. A limited central section of about 40 to 50 km is not yet completed or graded. This section lies between the villages of Los Frailes, Durango, on the east, and Soyatita (also known as El Sabino), Sinaloa, on the west. Travel is possible through this area, where the road is not yet completed, on unimproved roads using high clearance two-wheel drive vehicles. The two unconnected segments that extend through Los Frailes and Soyatita are graded, but each segment is unpaved for about the last 75 km. The central gap in the highway is in the rugged mountains of the Sierra Madre Occidental. This uncompleted and unpaved portion of the road is not well signed, there are many intersections with other unimproved roads, and it is easy to get lost off the intended route of the highway. As noted later, getting lost may not be a safe proposition. Further, the unfinished segment on the west is at about 820 meters elevation at Soyatita. Just outside Los Frailes, the road coming from the east is at 2,750 meters elevation. The traveler crossing this gap will have to negotiate this dramatic change in elevation traveling a good deal of the way on unimproved dirt roads. Travel times in this central section can be quite slow. This central portion of the highway passes directly through the region known as Mexico's Golden Triangle, notorious for drug cultivation, drug trafficking, and related violent drug incidents. Northern terminus to Hidalgo del Parral, Chihuahua Fed24 starts in the north at an intersection with the Fed. 16D. This intersection is at a point on the Fed. 16D that is 66 km east of Ciudad Cuauhtémoc and 38 km southwest of Chihuahua City. Fed. 24 then extends in a southerly direction for 184 km to Hidalgo del Parral, Chihuahua. At Hidalgo del Parral Fed. 4 intersects with Fed. 45 which connects Parral with Jiménez to the east and Durango to the south. Hidalgo del Parral to the junction at Las Yerbitas (Aserradero Yerbites), Chihuahua From Hidalgo del Parral, the finished section of paved highway going west runs some 220 km in a southwesterly direction to a highway junction at Las Yerbitas (Aserradero Yerbites), passing through El Vergel. Along this stretch of Fed. 24, at a point 46 km west of Hidalgo del Parral there is an intersection with CHI-23. From this intersection, CHI-23 runs north through Guachochi and Creel to eventually intersect Fed. 16, west of La Junta, Chihuahua. Las Yerbitas (Aserradero Yerbites) to Los Frailes, Durango From the junction at Las Yerbitas (Aserradero Yerbites), Fed. 24 continues in a southerly direction for about 75 kilometers past the village of Atascaderos (Buenavista de Atascaderos), Chihuahua, to Los Frailes, Durango, located on the border of Chihuahua and Durango. The highway is graded in all of this section, and is paved for only about 20 km after leaving the junction at Las Yerbitas. From the Las Yerbitas junction, a paved highway runs west for 25 km to Guadalupe y Calvo. Highway gap from the village of Los Frailes, Durango to the village of Soyatita, Sinaloa From Hidalgo del Parral, Fed. 24 was intended to extend southwest to cross the Sierra Madre Occidental mountain range to the coastal area of Culiacan in Sinaloa. However, about 75 km of central section of Fed. 24
</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.