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use std::fs::File;
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use std::io::{Read, Write};
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fn main() {
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let mut file = File::open("input.txt").unwrap();
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let mut data = Vec::new();
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file.read_to_end(&mut data).unwrap();
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let mut file = File::create("output.txt").unwrap();
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file.write_all(&data).unwrap();
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}
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