Summarize the following passage about the Great Wall of China:

The Great Wall of China, a massive structure built to protect China from invasions, stretches over 13,000 miles and was constructed across several dynasties. Its construction began in the 7th century BC, and later additions were made by various emperors. Not only was it a defense mechanism, but it also served as a means to control immigration and emigration, transport goods, and communicate using signal fires.
Summarize the following passage about the Great Wall of China:

The Great Wall of China, a massive structure built to protect China from invasions, stretches over 13,000 miles and was constructed across several dynasties. Its construction began in the 7th century BC, and later additions were made by various emperors. Not only was it a defense mechanism, but it also served as a means to control immigration and emigration, transport goods, and communicate using signal fires.
user
The Great Wall of China, built to protect against invasions, spans over 13,000 miles and was started in the 7th century BC. It was also used to control movement, transport goods, and communicate using signal fires.
assistant
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 this text says about huskies.

The Siberian husky has erect ears and eyes of brown to blue or maybe even one of each color.

The neck is carried straight and the topline is level. The well-furred tail is carried up in a sickle or sometimes straight out behind.

Siberian huskies have a very dense, plush coat with plenty of undercoat. A small ruff is found around the neck but no long fringes on the legs or tail. Color ranges from black to white and everything in-between. Most dogs do have white markings, particularly on the chest and legs.
Response: Siberian Huskies have straight necks with erect ears and brown and/or blue eyes. Their furry tails curve and their thick coats and undercoats create a ruff around their necks. They're usually black or white with white markings on the legs and chest.

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.
