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>
(which means "two" in Cantonese). Learning Center staff Carat Cheung as Mak Ka-ka (麥家嘉) A teacher at Ophelia's leaning center. Aware of the learning center's struggles she quits her job and steals the students to open her own learning center. After getting into problems with her new boss, she becomes unemployed and begs Judy Chu Lei San to give her another chance to work at their center. Having pity because she has to care for her little child, Judy agrees to rehire. Janice Shum as Teacher Si (施老師) Kenny Chan as Teacher Chan (陳老師) Kanice Lau as Teacher Lam (林老師) Ice Chow as Teacher Yeung (楊老師) Kimmi Tsui as Wing So Lai Ming as Sa (Sa姐) Real-estate staff Jerry Ku as Stone Sek Dong (石冬) Ku Tse-keung's best friend and work colleague. Sek Dong is the worst real-estate agent at his branch. Sek Dong depends on Tse-keung's completed sales contracts, which Tse-keung passes to his friend, to survive at work. Billy Cheung as Michael The boss of the real-estate firm Tse-keung works at. He is friendly and nice to Tse-keung until Tse-keung's real-estate license is suspended. Mandy Lam as Helen Tse-keung's work rival and enemy at the same real-estate firm. Tse-keung often mocks her because she has to leave work early or on time to care for her child. He also steals her accounts when she is not at the office. She takes over all of Tse-keung's accounts when his real-estate license is suspended. Bob Cheung as Real-estate employee (地產經紀) Tse-keung's immature work colleague. He is nicknamed Kwok Fu-sing (郭富城; Hong Kong singer Aaron Kwok's Chinese name) because of his resembles to the singer. Milkson Fong as Real-estate employee (地產經紀) Tse-keung's other immature work colleague. Physical Therapy center Henry Lo as Kwok Jo-hong (郭早康) King Lam as Si Hing (施興) Ceci So as Brenda Wong Fan-nuen (王芬暖) Kirby Lam as Lam Siu-ping (林少萍) Alan Tam Kwan-lun as Hung Wing-leung (洪永良) Joan Lee as To Kit-yee (杜潔兒) Extended cast Snow Suen as Bella Fung Yuet-na (馮月娜) Ku Tse-keung's ex-wife. Ku Tui-nam's mother. Pacino's newly wed wife. Due to getting married and honeymooning she has to leave her son with her ex-husband for an extended period of time. She and Tse-keung have a strained relation because he is unable to keep his promises to their son. Being used to Tse-keung's unreliable behavior she tests him and waits for him to fail at taking care of their son. Brian Burrell as Pacino Bella Fung Yuet-na's newly wed husband. Ku Tui-nam's new step-father. Ku Tse-keung doesn't like him and nicknames him Bat-chi-lo (白痴佬; "idiot" in English and Chinese homophone to the pronunciation of his name). Due to Tse-keung always being absent from Tui-nam's life, Pacino has had to take over as a father figure to Tui-nam, which Tse-keung becomes aware of and becomes jealous of. Toby Chan as Pat Marius' ex-secretary. She renews her contact with Marius and gets Ku Tse-keung to wrongly think Marius is having a secret affair behind the family's back. She just wants attention because her marriage is not loving and unique. She does not care that her child is very young and tries to commit suicide, but Marius and Tse-keung save her. Joe Junior as Mr. Kong (龔先生) Lo Mang as Rocky Ku Tse-keung's former real-estate client. Owner of an import logistic company. When Tse-keung's real-estate license is suspended and Tse-keung is out of work Rocky hires him as a shipment delivery person. Adam Ip as Lee Seung-yau (李相佑) Aaryn Cheung as Dave Lee Man-ko (李敏高) Fanny Lee as Mrs. Cheung (張太) Ophelia's landlord. Ku Tse-keung's client who filed
</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.