#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main()
{
  int t;
  cin>>t;
  while(t--) {
    int N; cin>>N;
    ll L[N];
    FOR(i,0,N) cin>>L[i];
    sort(L, L + N);
    int num[N];
    FOR(i,0,N) num[i] = 0;
    int bef = L[0];
    int j = 0;
    num[j]++;
    FOR(i,1,N) {
      if(bef!=L[i]) {
        j++;
        bef = L[i];
      }
      num[j]++;
    }
    int ans = 0;
    priority_queue<int> Q;
    FOR(i,0,N) if(num[i]!=0) Q.push(num[i]);
    while(!Q.empty()) {
      int a = Q.top();Q.pop();
      if(Q.empty()) break;
      int b = Q.top();Q.pop();
      if(Q.empty()) break;
      int c = Q.top();Q.pop();
      ans += c;
      a -= c; b-= c; c = 0;
      if(a > 0) Q.push(a);
      if(b > 0) Q.push(b);
    }
    cout << ans << endl;
  }
  return 0;
}