#include <fstream>
#define DIM 100002

using namespace std;

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

int tests, n, pos, result;
int pearl[DIM];

int A(){
    ++ pos;
    return pos;
}

//B -> 2B | 1A3AC
int B();

//C -> 2 | 3BC | 12A
int C();

int main(int argc, const char * argv[]) {
    
    in>>tests;
    while(tests --){
        in>>n;
        for(int i = 1; i <= n; ++ i){
            in>>pearl[i];
        }
        pos = 1;
        int ok = 0;
        result = A();
        if(result == n + 1)
            ok = 1;
        pos = 1;
        result = B();
        if(result == n + 1)
            ok = 1;
        pos = 1;
        result = C();
        if(result == n + 1)
            ok = 1;
        
        out<<ok<<'\n';
        for(int i = 1; i <= n; ++ i){
            pearl[i] = 0;
        }
    }
    
    return 0;
}

int B(){
    if(pearl[pos] == 2){
        ++ pos;
        return B();
    }
    if(pearl[pos] == 1 && pearl[pos + 2] == 3){
        pos += 4;
        return C();
    }
    return false;
}

//C -> 2 | 3BC | 12A
int C(){
    if(pearl[pos] == 2){
        ++ pos;
        return pos;
    }
    if(pearl[pos] == 3){
        ++ pos;
        B();
        return C();
    }
    if(pearl[pos] == 1 && pearl[pos + 1] == 2){
        pos += 3;
        return pos;
    }
    return false;
        
}