#include <fstream>
#include <cmath>
using namespace std;

bool b();
bool c();
bool a();

int i, n;
int s[10001];

bool a()
{
    if (i <= n)
    {
        i++;
        return 1;
    }
    return 0;
}

bool b()
{
    if (i <= n and s[i] != 3)
    {
        if (s[i] == 1)
        {
            i++;
            bool ok = a();
            ok &= (s[i++] == 3);
            ok &= a();
            ok &= c();
            return ok;
        }
        i++;
        return b();
    }
    return 0;
}

bool c()
{
    if (i > n)
        return 0;
    if (s[i] == 2)
    {
        return 1;
    }
    if (s[i] == 3)
    {
        i++;
        bool ok = b();
        ok &= c();
        return ok;
    }
    if (s[i] == 1 and s[i + 1] == 2)
    {
        i += 2;
        return a();
    }
    return 0;
}
int main()
{
    ifstream cin("perle.in");
    ofstream cout("perle.out");
    int t;
    cin >> t;
    while (t--)
    {
        cin >> n;
        for (i = 1; i <= n; i++)
            cin >> s[i];
        s[n + 1] = s[n + 2] = s[n + 3] = 0;
        if (n == 1)
        {
            cout << "1\n";
            continue;
        }
        i = 1;
        bool ans = 0;
        if (s[1] == 1)
        {
            if (n == 3)
                ans = c();
            else
                ans = b();
        }
        else if (s[1] == 2)
            ans = b();
        else
            ans = c();
        cout << ans << "\n";
    }
}