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 this in under 25 words, and use US currency. 

A Tyrannosaurus rex skeleton, made up of bones from three different T-rexes, has sold at auction for 5.5 million Swiss francs (that’s $9 million Australian or $US6.1 million).

Estimated to be 65 to 67 million years old, the skeleton was sold at the Koller auction house in Zurich, Switzerland, on April 18 after being shipped from the US in nine giant crates.

The skeleton, called Trinity, was put up for sale by an anonymous* American and was bought by a private European collector of modern art and dinosaur relics.
Response: On April 18, a 65-67 million years old skeleton made of bones from three T-rexes was auctioned for $US6.1 million. 

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 this historical event in less than 25 words: The Berlin Wall, a symbol of the Cold War, divided East and West Berlin from 1961 until its fall in 1989, reuniting Germany.
user
The Berlin Wall divided Berlin from 1961 until its fall in 1989, reuniting East and West Germany.
assistant