/**
 * Mar 12, 2016 7:13:10 PM
 * PrjName: Bc75-02
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static int[] a=new int[10];
    static int[][] f=new int[10][10];
    static boolean[] v=new boolean[10];
    static int n;
    static void init(){
        f[2][8]=f[8][2]=f[4][6]=f[6][4]=f[1][9]=f[9][1]=f[3][7]=f[7][3]=5;
        f[1][3]=f[3][1]=2;
        f[7][9]=f[9][7]=8;
        f[1][7]=f[7][1]=4;
        f[3][9]=f[9][3]=6;
    }
    static boolean check0(){
        for(int i=1;i<=n;i++)
            if (a[i]<1||a[i]>9) return false;
        return true;
    }
    static boolean check1(){
        for(int i=1;i<=n;i++)
            for(int j=i+1;j<=n;j++)
                if (a[i]==a[j]) return false;
        return true;
    }
    static boolean check2(){
        for (int i=1;i<n;i++){
            if (f[a[i]][a[i+1]]>0&&!v[f[a[i]][a[i+1]]]) return false;
            v[a[i]]=true;
        }
        return true;
    }
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        PrintWriter out=new PrintWriter(System.out);
        init();
        int T=in.nextInt();
        while(T-->0){
            n=in.nextInt();
            int cnt=0;
            for(int i=1;i<=n;i++){
                /*int tmp=in.nextInt();
                if (tmp>=1&&tmp<=9)
                    a[++cnt]=tmp;*/
                a[i]=in.nextInt();
            }
//            n=cnt;
            Arrays.fill(v, false);
            if (!check0()||n<4||!check1()||!check2())
                out.println("invalid");
            else
                out.println("valid");
        }
        out.flush();
        out.close();
    }

}
class InputReader {
    public BufferedReader reader;
    public StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream), 32768);
        tokenizer = null;
    }

    public String nextLine() {
        String tmp = null;
        try {
            tmp = reader.readLine();
            tokenizer = new StringTokenizer(tmp);
        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (NullPointerException e) {
            return null;
        }
        return tmp;
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

    public long nextLong() {
        return Long.parseLong(next());
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
}