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>
Ochanomizu Station is a railway station in Tokyo, Japan, operated by the East Japan Railway Company (JR East) and Tokyo subway operator Tokyo Metro. Lines Ochanomizu Station is serviced by the following lines: East Japan Railway Company Chūō Main Line (including Chūō Line and Chūō-Sōbu Line) Sōbu Main Line (including Chūō-Sōbu Line) Tokyo Metro Tokyo Metro Marunouchi Line Passengers can also transfer to nearby Shin-ochanomizu Station on the Tokyo Metro Chiyoda Line. Location JR East's Ochanomizu station lies next to the Kanda River. During the Edo period, the Kanda River was rerouted to pass through Ochanomizu, which was otherwise a highland between two valleys. Hijiribashi (聖橋, also known as Hijiri Bridge, Hijiribashi Bridge) crosses over the river near a station exit. The subway Marunouchi Line makes a short above-ground appearance as it passes over the river. Holy Resurrection Cathedral (Nicholai-dō) is easily accessible from the Hijiribashi Exit of this station. The Ochanomizu neighborhood is known for its many guitar and instrument shops. The Tokyo Metro station is located in Bunkyō Ward, separate from the JR East station, and is served by the Marunouchi Line. The area is also served by the Chiyoda Line at Shin-Ochanomizu, which is connected to Ogawamachi station on the Toei Shinjuku Line. JR East The JR East portion of the station has two island platforms serving four tracks. Tracks 1 and 4 (the outer tracks) serve trains on the Chūō Line whilst tracks 2 and 3 are used by trains on the Chūō-Sōbu Line. Platforms There are two exits from Ochanomizu to street level. The larger of the two is the Ochanomizu-bashi exit on the western end of the station which features ticket vending machines, a JR reservation office, toilets, and lockers. The other is the Hijiri-bashi exit which only has ticket vending machines and toilets. Adjacent stations Tokyo Metro The Tokyo Metro station consists of two side platforms serving two tracks. Platforms History The JR East station opened on 31 December 1904. The Tokyo Metro station opened on 20 January 1954. Passenger statistics In fiscal 2013, the JR East station was used by 104,737 passengers daily (boarding passengers only), making it the 34th-busiest station operated by JR East. In fiscal 2013, the Tokyo Metro station was used by an average of 55,529 passengers per day (exiting and entering passengers), making it the 66th-busiest station operated by Tokyo Metro. The average daily passenger figures for each operator in previous years are as shown below. Note that JR East figures are for boarding passengers only. Surrounding area Shin-Ochanomizu Station Akihabara Jinbōchō Kanda River Kanda Shrine Manseibashi Yasukuni-dōri Connecting bus services The Toei Bus operates local bus services from the following Ochanomizu Station bus stops. Ochanomizu-ekimae (Ochanomizu Station) No.1 Cha 51: for Komagome-eki-minamiguchi (Komagome Station South Entrance) No.2 Cha 51: for Akihabara-ekimae (Akihabara Station) No.3 Higashi 43: for Tokyo-eki-Marunouchi-kitaguchi (Tokyo Station Marunouchi North Entrance) No.4 Higashi 43: for Arakawa-dote-sōshajō-mae (Arakawa Riverbank Depot) and Kōhoku-ekimae (Kōhoku Station) Ochanomizu-ekimae (Higashi-guchi) (Ochanomizu Station (East Entrance)) No.5 Gaku 07: for Tōdai-kōnai (The University of Tokyo Hongo Campus) See also List of railway stations in Japan References External links JR East station information Tokyo Metro station information Category:Chūō-Sōbu Line Category:Sōbu Main Line Category:Chūō Main Line Category:Tokyo Metro Marunouchi Line Category:Stations of East Japan Railway Company Category:Stations of Tokyo Metro Category:Railway stations in Tokyo Category:Kanda, Tokyo Category:Railway stations opened in 1904 Category:1904 establishments in Japan
</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.