# include <fstream>
using namespace std;
ifstream in("perle.in");
ofstream out("perle.out");
int i,j,l,k,a[10005],n;
int B();
int C();
int B()
{
    if (l>k) return 0;
    int r=0;
    if (a[l]==2) {++l; r=B();}
    else {
             if (a[l]==1 && a[l+2]==3)
             {
                 l+=4;
                 r=C();
             }
         }
    return r;
}
int C()
{
    if (l>k) return 0;
    if (a[l]==2)
    {
        ++l; return 1;
    }
    else if (a[l]==3)
    {
        ++l;
        if (B()) return C();
    }
    else if (a[l]==1 && a[l+1]==2 && l+2<=k)
    {
        l+=3;
        return 1;
    }
    return 0;
}
int main ()
{
    in>>n;
    for (i=1; i<=n; ++i)
    {
        in>>k; l=1;
        for (j=1; j<=k; ++j)
            in>>a[j];
        if (k==1) out<<"1\n";
        else if (a[1]==2 || (a[1]==1 && a[3]==3)) out<<B()<<"\n";
            else out<<C()<<"\n";
    }
    return 0;
}