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: Please summarize the story below in a paragraph assuming the reader is a third-grader. 

The trio are alleged to have thrown rocks at other vehicles that night.

Three other people were injured after rocks were thrown at vehicles within a 45-minute span, the district attorney’s office said. Seven vehicles in all were struck, the statement said.

Bartell's vehicle was the last to be hit that night, authorities have said.

The three people now charged are 12th graders in Jefferson County Public Schools, a spokesperson for the Jefferson County Sheriff's Office said when they were arrested last week.

The three are alleged to have been in another vehicle driving when the rocks were thrown at other vehicles, the sheriff's office said.

In addition to the murder charge, each is charged with seven counts of attempted murder, three counts of second-degree assault and three counts of second-degree attempted assault, according to the district attorney's office.

One of the people whose vehicle was hit by a rock has described seeing another car's headlights in the dark and then hearing "what sounded like a shotgun blast" as his window was shattered.
Response: Three kids were throwing rocks at cars one night. When they were throwing rocks, they hurt three people. They hit seven cars. One Bartell was driving. The three kids are in 12th grade. The three kids were arrested for throwing rocks at cars. 

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 text for an elementary school student.

The Great Wall of China is an ancient series of walls and fortifications, totaling more than 13,000 miles in length, located in northern China. Perhaps the most recognizable symbol of China and its long and vivid history, the Great Wall was originally conceived by Emperor Qin Shi Huang in the third century B.C. as a means of preventing incursions from barbarian nomads. The best-known and best-preserved section of the Great Wall was built in the 14th through 17th centuries A.D., during the Ming dynasty.
user
The Great Wall of China is a very long wall, more than 13,000 miles, in northern China. It was first built a long time ago by Emperor Qin Shi Huang to keep out nomads. The most famous parts were built during the Ming dynasty.
assistant