fn classify_age(age: u32) -> &'static str {
    match age {
        0..=12 => "child",
        13..=19 if age % 2 == 0 => "teen even",
        13..=19 => "teen odd",
        n @ 20..=65 => if n >= 50 { "middle aged" } else { "young adult" },
        _ => "senior"
    }
}
 
fn main() {
    println!("{}", classify_age(25)); // middle aged
    println!("{}", classify_age(14)); // teen odd
    println!("{}", classify_age(16)); // teen even
}