#include <iostream>
#include <string>
#include <math.h>
using namespace std;

int m;
int x;
int y;

void Maybe(){
        if (m==0){
            if((((x==1)||(x==2)||(x==3))&&(y==0))||((x==2)&&(y==1))){
                cout<<"crystal"<<endl;
            }else{
                cout<<"empty"<<endl;
            }

        }else{
            if ((floor(y/((int)pow(5,m)))==0)&&((floor(x/((int)pow(5,m)))==1)||(floor(x/((int)pow(5,m)))==2)||(floor(x/((int)pow(5,m)))==3))){
                cout<<"crystal"<<endl;
            }else if((floor(x/((int)pow(5,m)))==2)&&(floor(y/((int)pow(5,m)))==1)){
               cout<<"crystal"<<endl;
            }else if((floor(y/((int)pow(5,m)))==1)&&(floor(x/((int)pow(5,m)))==1)){
               x=x-((int)pow(5,m));
               y=y-((int)pow(5,m));
               m--;
               Maybe();
            }else if((floor(x/((int)pow(5,m)))==2)&&(floor(y/((int)pow(5,m)))==2)){
                x = x - (2*(int)pow(5,m));
                y = y - (2*(int)pow(5,m));
                m--;
                Maybe();
            }else if((floor(x/((int)pow(5,m)))==3)&&(floor(y/((int)pow(5,m)))==1)){
                x = x-(3*(int)pow(5,m));
                y = y - ((int)pow(5,m));
                m--;
                Maybe();
            }else{
                cout<<"empty"<<endl;
            }
        }
}

int main() {

    int c;
    cin>>c;


    for(int i=0; i<c; i++){
        cin>>m;
        m--;

        cin>>x;

        cin>>y;

        Maybe();

    }

    return 0;
}