#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>   
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
#define ll long long
#define pb push_back               
#define mp make_pair        
#define nline "\n"                         
#define f first                                          
#define s second                                             
#define pll pair<ll,ll> 
#define all(x) x.begin(),x.end()   
#define vl vector<ll>         
#define vvl vector<vector<ll>>    
#define vvvl vector<vector<vector<ll>>>          
#ifndef ONLINE_JUDGE    
#define debug(x) cerr<<#x<<" "; _print(x); cerr<<nline;
#else
#define debug(x);  
#endif     
void _print(ll x){cerr<<x;} 
void _print(char x){cerr<<x;} 
void _print(string x){cerr<<x;}     
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); 
template<class T,class V> void _print(pair<T,V> p) {cerr<<"{"; _print(p.first);cerr<<","; _print(p.second);cerr<<"}";}
template<class T>void _print(vector<T> v) {cerr<<" [ "; for (T i:v){_print(i);cerr<<" ";}cerr<<"]";}
template<class T>void _print(set<T> v) {cerr<<" [ "; for (T i:v){_print(i); cerr<<" ";}cerr<<"]";}
template<class T>void _print(multiset<T> v) {cerr<< " [ "; for (T i:v){_print(i);cerr<<" ";}cerr<<"]";}
template<class T,class V>void _print(map<T, V> v) {cerr<<" [ "; for(auto i:v) {_print(i);cerr<<" ";} cerr<<"]";} 
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;
typedef tree<pair<ll,ll>, null_type, less<pair<ll,ll>>, rb_tree_tag, tree_order_statistics_node_update> ordered_pset;
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
const ll MOD=1e9+7;          
const ll MAX=1000100; 
void solve(){
    ll n; cin>>n;
    ll ans=0;  
    map<ll,ll> freq;
    for(ll i=1;i<=n;i++){
        ll x; cin>>x;
        freq[x]++;
    }
    for(auto it:freq){
        ll cur=it.s,freq=0;
        while(cur!=1){
            cur=(cur+1)/2;
            freq++;
        }
        ans=max(ans,freq);
    }
    cout<<ans<<nline;
    return;
}                
int main()                                                                                 
{                        
    ios_base::sync_with_stdio(false);                            
    cin.tie(NULL);                            
    #ifndef ONLINE_JUDGE                 
    freopen("input.txt", "r", stdin);                                           
    freopen("output.txt", "w", stdout);  
    freopen("error.txt", "w", stderr);                        
    #endif    
    ll test_cases=1;                   
    cin>>test_cases;
    while(test_cases--){
        solve();     
    }
    cout<<fixed<<setprecision(10);
    cerr<<"Time:"<<1000*((double)clock())/(double)CLOCKS_PER_SEC<<"ms\n"; 
}