#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("perle.in");
ofstream fout("perle.out");
int t,n,i,v[10001];
int B(int i);int C(int i);
int B(int i)
{
    if(i+1<=n&&v[i]==2)
        return B(i+1);
    if(i+4<=n&&v[i]==1&&v[i+2]==3)
        return C(i+4);
    return -1;
}
int C(int i)
{
    if(i+2<=n&&v[i]==3)return C((B(i+1)));
    if(i+2<=n&&v[i]==1&&v[i+1]==2)return i+3;
    if(i<=n&&v[i]==2)
        return i+1;
    return -1;
}
int main()
{
   fin>>t;

  while(t!=0){
        fin>>n;
        for(i=1;i<=n;i++)
            fin>>v[i];
        if(n==0){
            fout<<"0"<<"\n";
            t--;
            continue;
        }
        if(n==1){
            fout<<"1"<<"\n";
            t--;
            continue;
        }
        if(B(1)==n+1||C(1)==n+1){
            fout<<"1"<<"\n";
            t--;
            continue;
        }
        else{
            fout<<"0"<<"\n";
            t--;
            continue;
        }
    }
   }