// perle.cpp : This file contains the 'main' function. Program execution begins and ends there.
//


#include <fstream>
#include <string>

using namespace std;

ifstream in("perle.in");
ofstream out("perle.out");

int poz, n, a[100010], t, i, x;
bool adB();

bool adC() {
    if (poz > n)
        return 0;
    if (a[poz] == 2) {
        poz++;
        return 1;
    }
    if (a[poz] == 1 && a[poz + 1] == 2 && poz + 2 <= n) {
        poz += 3;
        return 1;
    }
    if (a[poz] == 3)
        return adB() && adC();
    return 0;
}

bool adB() {
    if (poz > n)
        return 0;
    if (a[poz] == 2) {
        poz++;
        return adB();
    }
    if (a[poz] == 1 && a[poz + 2] == 3)
    {
        poz += 4;
        return adC();
    }
    return 0;
}

int main() {
    in >> t;
    for (; t; t--) {
        in >> n;
        for (i = 1; i <= n; i++)
            in >> a[i];
        poz = 1;
        if (n == 1) {
            out << "1\n";
            continue;
        }
        if ((n >= 5 && a[1] == 1 && a[3] == 3) || a[1] == 2) {
            out << adB() << '\n';
            continue;
        }
        out << adC() << '\n';
    }
    return 0;
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file