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

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

const int MAXN = 10023;
long long t, n, a[MAXN];

int gasesteB(int ind);
int gasesteC(int ind);

int gasesteB(int ind)
{
    ///2B
    if(a[ind] == 2)
        return gasesteB(ind+1);
    ///1A3AC
    if(a[ind] == 1 && a[ind+2] == 3)
        return gasesteC(ind+4);
    return 0;
}

int gasesteC(int ind)
{
    ///2
    if(a[ind] == 2)
        return ind+1;
    ///3BC
    if(a[ind] == 3)
        return gasesteC(gasesteB(ind+1));
    ///12A
    if(a[ind] == 1 && a[ind+1] == 2)
        return ind+3;
    return 0;
}

int main()
{
    fin >> t;
    while(t--)
    {
        fin >> n;
        for(int i = 0; i < n; i++)
            fin >> a[i];
        fout <<(n == 1 || n == gasesteB(0) || n == gasesteC(0)) << "\n";
    }
    return 0;
}