#include <fstream>
using namespace std;
ifstream fin("perle.in");
ofstream fout("perle.out");
int n,t,i,v[10005];
int A(),B(),C();
int main(){
    for(fin>>t;t--;){
        fin>>n;
        for(i=1;i<=n;i++)
            fin>>v[i];
        i=1;
        if(A() && i==n+1){
            fout<<"1\n";
            continue;
        }
        i=1;
        if(B() && i==n+1){
            fout<<"1\n";
            continue;
        }
        i=1;
        if(C() && i==n+1){
            fout<<"1\n";
            continue;
        }
        fout<<"0\n";
    }
    return 0;
}
int A(){
    if(i==n+1)return 0;
    if(v[i]==1 || v[i]==2 || v[i]==3){
        i++; return 1;
    }
    return 0;
}
int B(){
    if(i==n+1)return 0;
    if(v[i]==2){
        i++; return B(); ///2B
    }
    if(v[i]==1){ ///1A3AC
        i++;
        int r=A();
        if(r==0)return 0;
        if(v[i]!=3)return 0;
        i++;
        r=A();
        if(r==0)return 0;
        return C();
    }
    return 0;
}
int C(){
    if(i==n+1)return 0;
    if(v[i]==2){
        i++;
        return 1;
    }
    if(v[i]==1){
        i++;
        if(v[i]!=2)return 0; ///12A
        i++;
        return A();
    }
    i++;
    int r=B();
    if(r==0)return 0; ///3BC
    return C();
}