#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
  ios::sync_with_stdio(false), cin.tie(nullptr);
  int t; cin >> t;
  while (t--) {
    int n; cin >> n;
    vector <int> a(n);
    for (auto& x:a) cin >> x;
    int ans (0), c(0);
    bool f (false);
    for (int i(0); i < n; i++) {
      if (a[i] == 1) {
         f = true; c++;
      }
      else if (a[i] != 2 && f) {
        c++;
      }
      else if (a[i] == 2) {
        f = false; c = 0;
      }
      if (a[i] == 3) {
        ans = max (ans, c);
      }
    }
    cout << ans << '\n';
  }
}