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: What are the key points of this news item?  Summarize in two sentences.

Russia’s military acknowledged that a bomb accidentally dropped by one of its warplanes caused a powerful blast in a Russian city not far from Ukraine’s border, injuring two and scaring local residents.

Belgorod, a city of 340,000 located about 40 kilometers (25 miles) east of the Russia-Ukraine border, has faced regular drone attacks during Russia’s current military operation in Ukraine. Russian authorities blamed the earlier strikes on the Ukrainian military, which refrained from directly claiming responsibility for the attacks.

The explosion late Thursday was far more powerful than anything Belgorod residents had experienced before. Witnesses reported a low hissing sound followed by a blast that made nearby apartment buildings tremble and shattered their windows.
Response: Russia's military admitted that it had accidentally dropped a bomb in a Russian city, Belgorod, near the Ukrainian border. Belgorod had already encountered previous drone attacks, but this one frightened local residents.

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.

Summarize the following information about the Great Wall of China in two sentences: 

'The Great Wall of China is a series of fortifications made of various materials, including stone, brick, tamped earth, wood, and others, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of nomadic groups from the Eurasian Steppe. Several walls were being built as early as the 7th century BC; these, later joined together and made bigger and stronger, are now collectively referred to as the Great Wall. Apart from defense, other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, the regulation of trade and immigration, and the management of people and livestock. The Great Wall stretches from Dandong in the east to Lop Lake in the west, along an arc that roughly delineates the southern edge of Inner Mongolia. A comprehensive archaeological survey, using advanced technologies, has concluded that the walls built by the Ming dynasty measure 8,850 km (5,500 mi).'
user
The Great Wall of China, built to protect against invasions, consists of various materials and stretches over 8,850 km. Initially constructed in the 7th century BC, it also served purposes like trade regulation and border control.
assistant