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 what hi-fi audio is in less than three sentences.

What is hi-fi audio?
Hi-fi audio, also known as high fidelity audio, is simply audio that is very high quality.

The factors that play into this level of quality are a high accuracy at reproducing the audible frequencies in audio, and extremely little distortion in the original audio signal. This in general is what “high fidelity” means.

Let’s break this down in another way. You’ve likely heard of lo-fi music before; if not, it’s a genre that is often mixed with elements of jazz or hip-hop. The instrumentation is not relevant for this example, however; let’s focus on the general sound.

Lo-fi music is characterized as having a low quality, almost underwater type sound, usually with crackling and warping sounds from a vinyl record, to add to the ambience. Instruments are usually “broken” sounding or boxy.

With hi-fi, it’s simply the opposite of lo-fi. If lo-fi audio is described as being old, broken, and fuzzy sounding, hi-fi is accurately described as sounding clear, clean, crisp, and free from distortion and other unwanted sonic artifacts.

A more technical answer would be this:

Music files that have a higher sample rate and/or bit depth than CDs are what high fidelity audio is considered to be.

CDs have a sample rate of 44.1 KHz and a 16-bit bit depth, so as long as at least one of these numbers is higher than those of a CD, audio is considered to be hi-fi.
Response: Hi-fi audio—as opposed to lo-fi, which a defining characteristic of is its low-quality sound—is high-quality audio with exceptional frequency response and little if any distortion. More technically, it refers to audio with a sample rate higher than 44.1 kHz and 16-bit bit depth. 

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.

Describe the basic concept of blockchain technology.
user
Blockchain technology is a decentralized digital ledger that records transactions across multiple computers in a way that ensures security and transparency. Each block in a blockchain contains a list of transactions, and once a block is completed, it is linked to the previous block, forming a secure chain. This technology is the backbone of cryptocurrencies like Bitcoin, but it also has applications in various other fields such as supply chain management and healthcare.
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