use std::collections::{HashMap, BinaryHeap};

fn main() {
    let mut t = String::new();
    std::io::stdin().read_line(&mut t).ok();
    let t: usize = t.trim().parse().unwrap();
    for _ in 0..t {
        let mut n = String::new();
        std::io::stdin().read_line(&mut n).ok();
        let n: usize = n.trim().parse().unwrap(); 
        let mut l = String::new();
        std::io::stdin().read_line(&mut l).ok();
        let mut mapping: HashMap<usize, usize> = HashMap::new();
        l.trim().split_whitespace()
            .map(|s| s.parse::<usize>().unwrap()).for_each(|i| {
                if let Some(x) = mapping.get_mut(&i) {
                    *x += 1;
                } else {
                    mapping.insert(i, 1);
                }
            })
        ;
        let mut l: BinaryHeap<usize> = mapping.iter().map(|pair| *pair.1).collect();
        let mut result: usize = 0;
        for _ in 0..n/3 {
            if l.len() < 3 { break; }
            let mut a = l.pop().unwrap();
            let mut b = l.pop().unwrap();
            let mut c = l.pop().unwrap();
            if a > 1 {
                a -= 1;
                l.push(a);
            }
            if b > 1 {
                b -= 1;
                l.push(b);
            }
            if c > 1 {
                c -= 1;
                l.push(c);
            }
            result += 1;
        }
        println!("{}", result);
    }
}