import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int T = scan.nextInt();
		int []ans = new int[T];
		Arrays.fill(ans, 0);
		ArrayList<Long> list = new ArrayList<Long>();
		for(int i = 0; i < T; i++) {
			int N = scan.nextInt();
			list.clear();
			for(int j = 0; j < N; j++) {
				list.add(scan.nextLong());
			}
			while(list.size() >= 1) {
				long t1, t2 = 0, t3 = 0;
				t1 = list.get(0);
				list.remove(0);
				for(int j = 0; j < list.size(); j++) {
					t2 = list.get(j);
					if(t1 != t2) {
						list.remove(j);
						break;
					}
				}
				for(int j = 0; j < list.size(); j++) {
					t3 = list.get(j);
					if(t3 != t2 && t3 != t1) {
						list.remove(j);
						ans[i]++;
						break;
					}
				}
			}
		}
		scan.close();
		for(int i = 0; i < T; i++) {
			System.out.println(ans[i]);
		}
	}
}