Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: Source text:
At its simplest, forex trading is similar to the currency exchange you may do while traveling abroad: A trader buys one currency and sells another, and the exchange rate constantly fluctuates based on supply and demand.

Currencies are traded in the foreign exchange market, a global marketplace that’s open 24 hours a day Monday through Friday. All forex trading is conducted over the counter (OTC), meaning there’s no physical exchange (as there is for stocks) and a global network of banks and other financial institutions oversee the market (instead of a central exchange, like the New York Stock Exchange).

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A vast majority of trade activity in the forex market occurs between institutional traders, such as people who work for banks, fund managers and multinational corporations. These traders don’t necessarily intend to take physical possession of the currencies themselves; they may simply be speculating about or hedging against future exchange rate fluctuations.

A forex trader might buy U.S. dollars (and sell euros), for example, if she believes the dollar will strengthen in value and therefore be able to buy more euros in the future. Meanwhile, an American company with European operations could use the forex market as a hedge in the event the euro weakens, meaning the value of their income earned there falls.

Summarization request:
Briefly summarize how forex trading works and who the major players are.
Response: Forex trading involves exchanging one currency for another. The value of currencies fluctuates constantly based on supply and demand as well as economic factors. Most forex trading is done between large institutions like banks, fund managers, and multinational companies. These major players speculate on the strength of currencies or hedge against changes. They don’t usually take physical possession of the currencies.

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.

Source text:

Extractive summarization is a widely used approach in text summarization. It involves selecting the most important sentences or phrases from the original text and combining them to create a summary. This method does not involve generating new text or paraphrasing the original content.

The process of extractive summarization typically involves the following steps:

1. Preprocessing: The input text is cleaned and processed, which may include tasks like tokenization, removing stop words, and stemming or lemmatization.

2. Sentence scoring: Each sentence in the text is assigned a score based on various features that indicate its importance. These features can include the presence of keyword phrases, sentence position (e.g., introductory or concluding sentences), sentence length, and the presence of named entities or numerical data.

3. Sentence selection: Based on the scores assigned in the previous step, the top-scoring sentences are selected for inclusion in the summary. This selection can be based on a predefined threshold or a desired summary length.

4. Summary generation: The selected sentences are combined to form the final summary, often preserving their original order in the text.

Extractive summarization has several advantages, including its simplicity, efficiency, and the fact that it preserves the original wording and style of the text. However, it can sometimes produce incoherent or disconnected summaries, as the selected sentences may lack context or fail to capture the overall flow of the original text.
user
Extractive summarization is an approach where the most important sentences or phrases from the original text are selected and combined to create a summary. It involves preprocessing the text, scoring each sentence based on features like keywords, position, and length, selecting top-scoring sentences, and combining them to generate the final summary. While straightforward and preserving the original wording, extractive summaries can sometimes lack coherence or fail to capture the overall flow of the text.
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