use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let t: usize = itr.next().unwrap().parse().unwrap();
    let mut out = Vec::new();
    for _ in 0..t {
        let n: usize = itr.next().unwrap().parse().unwrap();
        let a: Vec<usize> = (0..n)
            .map(|_| itr.next().unwrap().parse().unwrap())
            .collect();

        let mut map = std::collections::HashMap::new();
        let mut bh = std::collections::BinaryHeap::new();
        for i in 0..n {
            let p = map.entry(a[i]).or_insert(0);
            *p += 1;
        }
        for (&_k, &v) in map.iter() {
            bh.push(v);
        }

        let mut ans = 0;
        while bh.len() > 2 {
            let a = bh.pop().unwrap();
            let b = bh.pop().unwrap();
            let c = bh.pop().unwrap();
            if a > 0 {
                bh.push(a - 1);
            }
            if b > 0 {
                bh.push(b - 1);
            }
            if c > 0 {
                bh.push(c - 1);
            }
            if a > 0 && b > 0 && c > 0 {
                ans += 1;
            }
        }
        writeln!(out, "{}", ans).ok();
    }
    stdout().write_all(&out).unwrap();
}