import java.util.Scanner;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int t  = Integer.valueOf(sc.nextLine());
        for(int i = 0; i < t; i++){
            int n = Integer.valueOf(sc.nextLine());
            int sum = 0;
            StringTokenizer st = new StringTokenizer(sc.nextLine());
            while(st.hasMoreTokens()){
                sum += Integer.valueOf(st.nextToken());
            }
            if(sum % 2 == 0){
                System.out.println("POSSIBLE");
            }
            else{
                System.out.println("IMPOSSIBLE");
            }
        }

    }

}