#include<fstream>
 
using namespace std;
 
ifstream cin("perle.in");
ofstream cout("perle.out");
 
int n,v[10005],q, i;
inline int B(int numb);
int C(int numb);
 
 
 
inline int B(int numb)
{
    if( numb > q )
        return 0;
    else if(v[numb]==2)
        return B(numb+1);
    else
        if(v[numb]==1 && v[numb+2]==3)
            return C(numb+4);
 
return 0;
}
 
 
 
 
inline int C(int numb)
{
    if( numb > q)
        return 0;
    else if(v[numb]==2)
        return numb;
    else
    if(v[numb]==3)
    {   int k=B(numb+1);
        if(k)
                return C(k+1);
    }
        else if(v[numb]==1 && v[numb+1]==2)
            return numb+2;
 
            return 0;
 
}
void read()
{
    cin>>n;
    while(n)
    {
        cin>>q;
        for(i=1;i<=q;i++)
            cin>>v[i];
        if(q==1)
            cout<<1<<"\n";
        else if(B(1)==q || C(1)==q)
            cout<<1<<"\n";
        else cout<<0<<"\n";
 
        n--;
    }
}
int main()
{
    read();
    return 0;
}