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/*...Bismillahir Rahmanir Rahim...*/
// #pragma GCC optimize ("Ofast,unroll-loops")
// #pragma GCC target ("avx2")
#include <bits/stdc++.h>
using namespace std;

//debug..........
#ifdef Abdul_Aziz
#include "debug.cpp"
#else
#define dbg(x...)
#endif

#define   int  long long
#define   ll   long long
#define   ld   long double
#define   pb   push_back
#define   vi   vector<int>
#define   bitcount(x)  (int)__builtin_popcount(x)
#define   Lsb(x)  (int)__builtin_ctzll(x)
#define   fast  ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define   sz(x)  (int)x.size()
#define   all(a) (a).begin(),(a).end()
#define   Yes  cout << "YES\n"
#define   No  cout << "NO\n"
#define   ff   first
#define   ss   second
#define   endl  "\n"
#define   pi   acos(-1.0)
#define   pii  pair<int,int>
#define   lcm(a,b) (a/__gcd(a, b)*b)

const int  mod = 998244353 ;
const int N = 200005 ;
const int inf = 2147483647;

inline void solve() {
    int n ; cin >> n ;
    map <int, int> cnt;
    while (n--) {
        int x; cin >> x;
        cnt[x] += 1;
    }
    int ans = 0;
    for (auto ii: cnt) {
        ans += ii.ss / 3;
    }
    cout << ans << endl;
}

signed main()
{
    fast ;
    int t = 1 ;  cin >> t ;
    while (t--) solve() ;
    return 0 ;
}