// Pratiyush Mishra

#include <bits/stdc++.h>
#define ll long long int
using namespace std;

void mainSolve()
{
    int n;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++)
        cin >> v[i];
    map<int, int> freq;
    for (int x : v)
        ++freq[x];
    int max_freq = 0;
    for (auto it : freq)
        max_freq = max(max_freq, it.second);
    int ans = 0;
    ll val = 1;
    while(val < max_freq)
    {
        ++ans;
        val*=2ll;
    }
    cout<<ans<<endl;
}

int main()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    int t;
    cin >> t;
    while (t--)
    {
        mainSolve();
    }
    return 0;
}