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fn main() {
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println!("Sum: {}", (1..10).fold(0, |acc, n| acc + n));
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println!("Product: {}", (1..10).fold(1, |acc, n| acc * n));
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let chars = ['a', 'b', 'c', 'd', 'e'];
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println!("Concatenation: {}",
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chars.iter().map(|&c| (c as u8 + 1) as char).collect::<String>());
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}
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