#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  Int T;
  cin>>T;
  while(T--){
    Int n;
    cin>>n;
    vector<Int> x(n);
    for(Int i=0;i<n;i++) cin>>x[i];
    map<Int, Int> y;
    for(Int i=0;i<n;i++) y[x[i]]++;
    
    Int l=0,r=n+1;

    
    auto check=
      [&](Int d){
	Int res=0;
	for(auto p:y) res+=min(d,p.second);
	return res/3>=d;
      };

    while(l+1<r){
      Int m=(l+r)>>1;
      if(check(m)) l=m;
      else r=m;
    }
    cout<<l<<endl;
  }
  return 0;
}