#include <iostream>
#include <fstream>
#define For(i,a,b) for (int i=(a);i<=(b);++i)
using namespace std;
int v[10005],k,n;
ifstream f("perle.in");
ofstream g("perle.out");

int PerlaMagicaB(int);
int PerlaMagicaC(int);

int PerlaMagicaB(int i)
{
    if (i<=k)
    {
        if (v[i]==2) return PerlaMagicaB(i+1);
        else if (v[i]==1 && v[i+2]==3) return PerlaMagicaC(i+4);
    }
    return -1;
}
int PerlaMagicaC(int i)
{
    if (i<=k)
    {
        if (v[i]==2) return i+1;
        else if (v[i]==3) return PerlaMagicaC(PerlaMagicaB(i+1));
        else if (v[i]==1 && v[i+1]==2) return i+3;
    }
    return -1;
}
int main()
{
    f>>n;
    For(i,1,n)
    {
        f>>k;
        For(j,1,k)
         {f>>v[j];}
        if (k==1) g<<1<<"\n";
        else g<<(PerlaMagicaB(1)==k+1 || PerlaMagicaC(1)==k+1)<<"\n";
    }
    return 0;
}