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>
from Fig. 37 showing a bract bearing lateral segments and basal sporangia. Dotted lines indicate projections representing lateral segments preserved under bract. D, E, oblique abaxial view of fertile units showing a bract with lateral segments and basal pendulous sporangia. F, side view of a fertile unit from Fig. 28 illustrating a bract with distal segment (arrow), lateral segments and basal sporangia. In side view, it is clear that many pendulous sporangia are abaxially attached at the base of a bract (Figs 28, black arrow, 39, arrow, 42F). It is also the case in abaxial (Figs 29, lower arrow, 37, arrow, 42B, arrow, 42C) and oblique abaxial (Figs 35, 36, black arrow) views of a bract. In adaxial view, about 2.0 mm above the attachment point to the strobilar axis, the bract blade possesses a linear depression (Fig. 42A, arrow 3) indicating the position where the abaxial sporangia were once attached. Corresponding to this example, abaxial sporangia are pendulous at the bract 3.3 mm away from the node of the strobilar axis (Fig. 38, arrow). Sporangia are sometimes observed along the vertically central area of the strobilar axis (Figs 24, white arrows, 27, white arrows) and, as illustrated in Figure 41, they are attached at the same level although their bract is indistinct (except the fertile unit in Fig. 27, middle white arrow) or has broken off when the specimens were split. When enlarged from the corresponding area of another strobilar axis, it is obvious that the sporangia are also inserted at the same level (Fig. 31). Sporangia are elongate in shape, showing no evident morphological differences with the lateral segments of the bract. Unfortunately, we have not found any spores or dehiscence of these sporangia. Anatomy An anatomically preserved sterile axis collected from the Huangkuang section (Fig. 40, arrow) shows that this plant possesses an actinostele, which is rounded-triangular shaped and c. 1.7 mm in diameter (Fig. 43). The xylem consists of a central primary xylem column and a surrounding zone of secondary xylem. The extraxylary tissues have not been preserved. In some portions of the xylem, the tracheids have broken down as a result of preservation. The primary xylem is roughly triarch in outline and has three xylem ribs with three shallow concave sides between. One rib is shorter radially than the other two, and the tips of three ribs are widely spaced. The ribs vary in radial dimension from 560 to 750 µm, and average 520 µm in tangential dimension. In this transverse section, the primary xylem is composed entirely of polygonal tracheids. The protoxylem tracheids are 12–(20)−30 µm in diameter and located at the tips of the ribs (Fig. 43, arrows). The tracheids of the metaxylem are 25–(60)−85 µm and generally centripetally increase in diameter. They are significantly larger than those of the protoxylem and secondary xylem. The secondary xylem opposite the shorter primary rib are strongly limonitized. Rays are indistinct in the compact secondary xylem. In contrast, abundant tracheids are arranged in radial files. The tracheid files vary in tangential dimension. The tetragonal tracheids of the secondary xylem are 17–(30)−45 µm in diameter, usually with the smaller ones situated beside the periphery of the metaxylem strand (Fig. 44, arrows). From inner to outer regions, the secondary xylem tracheids either appear relatively constant or gradually increase or abruptly decrease in size (Figs 43, 44). COMPARISONS Hamatophyton verticillatum is an important member of the Upper Devonian (Famennian) plant assemblage in China. It was established by Gu & Zhi (1974: 38–39) and described as having clear axis nodes and ribbed internodes, whorls of leaves with occasional hooked tips
</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.