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: Summarize the information about retinoids. Here is the information:
Retinoid: The term "retinoid" is a catch-all for an array of vitamin A-based products used on skin. It can treat mild fine lines and wrinkles, acne, and dark spots. It can also improve skin texture.

If you’re looking to treat uneven skin tone, dark spots, or your skin’s texture, look for the word “retinol.” It’s a type of retinoid that’s used for these purposes.

Retinol can give you younger-looking skin by speeding up new skin cell turnover, which starts to slow in your 20s.

To treat acne, dermatologists prescribe one of these retinoids – adapalene, tazarotene, tretinoin, or trifarotene. You’ll also find adapalene in an acne-fighting product available without a prescription.

When spread on acne-prone skin, a retinoid can unclog pores. This can give you clearer skin and allow other acne gels and creams to work better.

When to apply a retinoid: Dr. Baxt recommends applying a retinoid before bed. After washing your face, wait 20 to 30 minutes and then apply it.

If you find the retinoid too drying, apply a moisturizer immediately after washing your face, using a moisturizer that won’t clog your pores. Then apply the retinoid 20 to 30 minutes later.
Response: Retinoids are vitamin A-based products. They have been found to treat mild fine lines, acne, wrinkles, and dark spots and improve skin texture. Apply retinoids 20 to 30 minutes after washing your face before bed.

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.

Explain the difference between extractive and abstractive text summarization, and discuss the advantages and limitations of each approach.
user
Text summarization can be broadly categorized into two approaches: extractive and abstractive summarization.

Extractive summarization involves selecting and concatenating the most informative sentences or phrases from the original text to form the summary. This approach is relatively straightforward and can be achieved using techniques like sentence scoring based on factors like word frequency, position, and context. The main advantage of extractive summarization is its simplicity and interpretability, as the summary consists of actual text segments from the original document. However, extractive summaries may lack coherence and fluency, as the selected sentences were not originally designed to be concatenated in that order.

On the other hand, abstractive summarization generates entirely new sentences that capture the main ideas of the source text in a concise and natural way. This approach involves a deeper understanding of the text's semantics and the ability to paraphrase and synthesize information from multiple parts of the document. Abstractive summaries can be more coherent, concise, and tailored to the specific needs of the user. However, abstractive summarization is a more challenging task, requiring advanced natural language generation capabilities and a deeper understanding of the text's meaning, context, and discourse structure.

Both approaches have their advantages and limitations. Extractive summarization is generally simpler and more interpretable, but may result in less coherent summaries. Abstractive summarization can produce more natural and concise summaries, but is more complex and prone to introducing errors or factual inaccuracies if the text is not fully understood.

In practice, many modern summarization systems employ a hybrid approach, combining extractive and abstractive techniques to leverage the strengths of both methods. They may use extractive methods to identify the most salient information and then apply abstractive techniques to paraphrase and synthesize the extracted content into a coherent summary.
assistant