use std::collections::HashMap;

fn main() {
    let mut scores = HashMap::new();
    scores.insert("Alice", 85);
    scores.insert("Bob", 92);
    scores.insert("Carol", 78);
    scores.insert("Dave", 88);

    // Retain only scores of 80 or above
    scores.retain(|_name, &mut score| score >= 80);

    println!("{:?}", scores); // Output: {"Alice": 85, "Bob": 92, "Dave": 88}
}
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