#include <fstream>
using namespace std;
ifstream fin ("perle.in");
ofstream fout ("perle.out");
int N, L, step, ok, V[10010];
bool Recursiv_C();


bool Recursiv_B()
{
    //  B -> 2B | 1A3AC
    if (step > L) return 0;
    if (V[step] == 2)
    {
        step += 1;
        return Recursiv_B();
    }
    if (V[step] == 1 && V[step+2] == 3 && step+4 <= L)
    {
        step += 4;
        return Recursiv_C();
    }
    return 0;
}

bool Recursiv_C()
{
    //  C -> 2 | 3BC | 12A
    if (step > L) return 0;
    if (V[step] == 2)
    {
        step += 1;
        return 1;
    }
    if (V[step] == 3)
    {
        step += 1;
        if (Recursiv_B()) return Recursiv_C();
    }
    if (V[step] == 1 && V[step+1] == 2 && step+2 <= L)
    {
        step += 3;
        return 1;
    }
    return 0;
}

int main()
{
    fin >> N;
    for (int i=1; i<=N; i++)
    {
        fin >> L;
        for (int j=1; j<=L; j++) fin >> V[j];

        step = 1;
        if (step == L) fout << "1\n";
        else if (V[step] == 2 || (V[step] == 1 && V[step+2] == 3)) fout << Recursiv_B() << '\n';
        else fout << Recursiv_C() << '\n';
    }
    fout.close();
    return 0;
}