import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        byte a = s.nextByte();
        for(byte i = 0; i < a; i++) {
            int n = s.nextInt();
            int x = s.nextInt();
            int y = s.nextInt();
            if(find(n, x, y))
                System.out.println("crystal");
            else
                System.out.println("empty");
        }

    }
    static boolean find(int n, int x, int y) {
        int a = (int) Math.pow(5, n - 1); //n x n grid
        //if x is less than 1/5 of iterants

        int X = x / a;
        int Y = y / a;
        if(((X == 1 || X == 3) && Y == 0) || (X == 2 && (Y == 0 || Y == 1))) {
            return true;
        }
        else if(n == 1)
            return false;
        else if(X == 1 && Y == 1)
            return find(n - 1, x - a, y - a);
        else if(X == 3 && Y == 1) {
            return find(n - 1, x - (3 * a), y - a);
        }
        else if(X == 2 && Y == 2) {
            return find(n - 1, x - (2 * a), y - (2 * a));
        }
        else
            return false;

    }
}