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>
North Central West Virginia Airport North Central West Virginia Airport is a public/military airport a mile northeast of Bridgeport and six miles east of Clarksburg, in Harrison County, West Virginia. It is owned and operated by the Benedum Airport Authority, serving Harrison and Marion County, and was formerly Benedum Airport and Harrison-Marion Regional Airport. The airport sees two airlines, with some passenger service subsidized by the Essential Air Service program. Federal Aviation Administration records say the airport had 36,917 passenger boardings (enplanements) in calendar year 2018, 25,105 in 2017 and 10,694 in 2010. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a primary commercial service airport (more than 10,000 enplanements per year). History The airport opened in 1935 as the Tri-County Airport, a joint effort of Harrison, Marion and Taylor County. It was a grass airstrip on leased land. In 1937 Marion and Taylor County withdrew from the project; in 1938 Harrison County purchased land to expand the airport. In 1944 the airport was renamed Benedum Airport after Michael L. Benedum. In the 1950s the airport had 3719-foot runway 5 and 2978-foot runway 16; around 1964 both were replaced by 5200-ft runway 3 and 2500-ft runway 13. The first airline flights were Capital DC-3s in 1949; Lake Central replaced Capital at the end of 1960, and successor Allegheny's last Convair left about the end of 1977. The runway was extended to in 1999. The current airport authority was established in 1960. Enplanements for 2018 were 36,917 up from 25,105 the year before, a 47% increase. In August 2019 West Virginia governor Jim Justice came to the airport to announce a $20 million dollar investment to be made at the airport: a new terminal, taxiways, and more space for economic development. Facilities The airport covers 434 acres (176 ha) at an elevation of 1,224 feet (373 m). Its single one runway, 3/21, is 7,800 by 150 feet (2,377 x 46 m) long. It has one helipad, 50 by 50 feet (15 x 15 m) In the year ending October 31, 2011 the airport had 24,600 aircraft operations, average 67 per day: 54% military, 35% general aviation, 10% air taxi, and <1% airline. 80 aircraft were then based at this airport: 61% single-engine, 20% multi-engine, 4% jet, and 15% military. Airlines and destinations Scheduled passenger service: Statistics Top destinations References Other sources Essential Air Service documents (Docket DOT-OST-2005-20736) from the U.S. Department of Transportation: Notice (March 22, 2005): of Air Midwest, Inc. of its intent to discontinue scheduled non-subsidized Essential Air Service between Clarksburg/Fairmont, West Virginia and Pittsburgh, Pennsylvania, effective June 20, 2005. Order 2005-4-19 (April 19, 2005): prohibiting Air Midwest, Inc., from terminating its unsubsidized, scheduled air service at Parkersburg, Morgantown and Clarksburg/Fairmont, West Virginia, beyond the end of its 90-day notice periods, and requesting proposals from carriers interested in providing replacement essential air service (EAS) at the communities, with or without subsidy. Order 2005-9-8 (September 9, 2005): selecting RegionsAir, Inc. to provide subsidized essential air Service (EAS) at Parkersburg, Morgantown and Clarksburg/Fairmont, West Virginia for a two-year period and establishing a combined subsidy rate of $1,051,333 per year for service consisting of 18 nonstop round trips each week between Parkersburg and Cincinnati, and 18 round trips to Cincinnati each week over a MGW-CKB-CVG-CKB-MGW routing, with 34-seat Saab 340A aircraft. Order 2007-1-16 (January 25, 2007): selecting Colgan Air, Inc. d/b/a US Airways Express to provide subsidized essential air service (EAS) at Parkersburg, Morgantown, and Clarksburg/Fairmont, West Virginia, for two years, beginning when the carrier inaugurates service. Each community will receive 19 weekly round trips to Pittsburgh with
</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.