import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.Collections; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.PriorityQueue; public class Main_yukicoder120 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); Printer pr = new Printer(System.out); int t = sc.nextInt(); for (int tcase = 0; tcase < t; tcase++) { int n = sc.nextInt(); Map hm = new HashMap(); for (int i = 0; i < n; i++) { int l = sc.nextInt(); if (!hm.containsKey(l)) { hm.put(l, 1); } else { hm.put(l, hm.get(l) + 1); } } PriorityQueue pq = new PriorityQueue(Collections.reverseOrder()); pq.addAll(hm.values()); int ret = 0; while (pq.size() >= 3) { int tmp1 = pq.remove(); int tmp2 = pq.remove(); int tmp3 = pq.remove(); ret += tmp3; if (tmp2 - tmp3 != 0) { pq.add(tmp2 - tmp3); } if (tmp1 - tmp3 != 0) { pq.add(tmp1 - tmp3); } } pr.println(ret); } pr.close(); sc.close(); } @SuppressWarnings("unused") private static class Scanner { BufferedReader br; Iterator it; Scanner (InputStream in) { br = new BufferedReader(new InputStreamReader(in)); } String next() throws RuntimeException { try { if (it == null || !it.hasNext()) { it = Arrays.asList(br.readLine().split(" ")).iterator(); } return it.next(); } catch (IOException e) { throw new IllegalStateException(); } } int nextInt() throws RuntimeException { return Integer.parseInt(next()); } long nextLong() throws RuntimeException { return Long.parseLong(next()); } float nextFloat() throws RuntimeException { return Float.parseFloat(next()); } double nextDouble() throws RuntimeException { return Double.parseDouble(next()); } void close() { try { br.close(); } catch (IOException e) { // throw new IllegalStateException(); } } } private static class Printer extends PrintWriter { Printer(PrintStream out) { super(out); } } }