Problem: Note that the only difference between the easy and hard version is the constraint on the number of queries. You can make hacks only if all versions of the problem are solved.

This is an interactive problem.

You are given a tree consisting of n nodes numbered with integers from 1 to n. Ayush and Ashish chose two secret distinct nodes in the tree. You need to find out both the nodes. You can make the following query: 

  * Provide a list of nodes and you will receive a node from that list whose sum of distances to both the hidden nodes is minimal (if there are multiple such nodes in the list, you will receive any one of them). You will also get the sum of distances of that node to the hidden nodes. 



Recall that a tree is a connected graph without cycles. The distance between two nodes is defined as the number of edges in the simple path between them.

More formally, let's define two hidden nodes as s and f. In one query you can provide the set of nodes \\{a_1, a_2, …, a_c\} of the tree. As a result, you will get two numbers a_i and dist(a_i, s) + dist(a_i, f). The node a_i is any node from the provided set, for which the number dist(a_i, s) + dist(a_i, f) is minimal.

You can ask no more than 11 queries.

Input

The first line contains a single integer t (1 ≤ t ≤ 10) — the number of test cases. Please note, how the interaction process is organized.

The first line of each test case consists of a single integer n (2 ≤ n ≤ 1000) — the number of nodes in the tree.

The next n - 1 lines consist of two integers u, v (1 ≤ u, v ≤ n, u ≠ v) — the edges of the tree.

Interaction

To ask a query print a single line: 

  * In the beginning print "? c " (without quotes) where c (1 ≤ c ≤ n) denotes the number of nodes being queried, followed by c distinct integers in the range [1, n] — the indices of nodes from the list. 



For each query, you will receive two integers x, d — the node (among the queried nodes) with the minimum sum of distances to the hidden nodes and the sum of distances from that node to the hidden nodes. If the subset of nodes queried is invalid or you exceeded the number of queries then you will get x = d = -1. In this case, you should terminate the program immediately.

When you have guessed the hidden nodes, print a single line "! " (without quotes), followed by two integers in the range [1, n] — the hidden nodes. You can output the hidden nodes in any order.

After this, you should read a string. If you guess the nodes correctly, you will receive the string "Correct". In this case, you should continue solving the remaining test cases or terminate the program, if all test cases were solved. Otherwise, you will receive the string "Incorrect". In this case, you should terminate the program immediately.

Guessing the hidden nodes does not count towards the number of queries asked.

The interactor is not adaptive. The hidden nodes do not change with queries.

Do not forget to read the string "Correct" / "Incorrect" after guessing the hidden nodes.

You need to solve each test case before receiving the input for the next test case.

The limit of 11 queries applies to each test case and not to the entire input.

After printing a query do not forget to output the end of the line and flush the output. Otherwise, you will get Idleness limit exceeded. To do this, use:

  * fflush(stdout) or cout.flush() in C++;
  * System.out.flush() in Java;
  * flush(output) in Pascal;
  * stdout.flush() in Python;
  * see the documentation for other languages.



Hacks

To hack the solution, use the following test format:

The first line should contain a single integer t (1 ≤ t ≤ 10) — the number of test cases. The description of the test cases follows.

The first line of each test case should contain a single integer n (2 ≤ n ≤ 1000) — the number of nodes in the tree. The second line should contain two distinct integers in the range [1, n] — the hidden nodes. The next n - 1 lines should contain two integers u, v (1 ≤ u, v ≤ n, u ≠ v) — the edges of the tree.

Example

Input


1
3
1 2
1 3

1 1

2 3

3 1

3 1

Correct

Output


? 1 1

? 1 2

? 1 3

? 2 2 3

! 1 3

Note

The tree from the first test is shown below, and the hidden nodes are 1 and 3.

<image>

Solution (in JAVA):

Solution:
import java.util.*;
import java.io.*;

@SuppressWarnings("unchecked")
public class hiddenpair {
    static BufferedReader in;
    int N, maxDepth, root, minDist;
    int[] depth;
    ArrayList<Integer>[] adj;

    hiddenpair() throws IOException {
        StringTokenizer st = new StringTokenizer(in.readLine());
        N = Integer.parseInt(st.nextToken());
        adj = new ArrayList[N];
        for (int i = 0; i < N; i++) adj[i] = new ArrayList<>(2);
        for (int i = 1; i < N; i++) {
            st = new StringTokenizer(in.readLine());
            int a = Integer.parseInt(st.nextToken()) - 1;
            int b = Integer.parseInt(st.nextToken()) - 1;
            adj[a].add(b);
            adj[b].add(a);
        }
        depth = new int[N];
        depth[0] = -1;
        maxDepth = 0;
        root = findCentroid();
        // System.out.println("centroid " + root);
        genTreeInfo(root, root);

        // Find base depth
        ArrayList<Integer> toQuery = new ArrayList<>(N);
        for (int i = 0; i < N; i++) toQuery.add(i+1);
        Pair result = query(toQuery);
        minDist = result.d;

        Pair correctResult = null;
        // Binary search on depth
        int low = 0, high = maxDepth;
        while (low < high) {
            int mid = (low + high + 1) / 2;
            result = check(mid);
            if (minDist == result.d) {
                low = mid;
                correctResult = result;
            } else {
                high = mid - 1;
            }
        }

        // One of the nodes is found; find the other one
        int firstNode = correctResult.n;
        // System.out.println("first node is " + firstNode);
        int secondNode = findSecondNode(firstNode);
        System.out.printf("! %d %d\n", firstNode+1, secondNode+1);
        System.out.flush();

        if (in.readLine().equals("Incorrect")) System.exit(0);
    }

    ArrayList<Pair> nodesWithDist;
    int findSecondNode(int firstNode) {
        // Find nodes with right distance
        nodesWithDist = new ArrayList<>();
        findNodesWithDist(firstNode, firstNode, 0);

        ArrayList<Integer> toQuery = new ArrayList<>();
        for (Pair p : nodesWithDist) {
            toQuery.add(p.d);
        }
        Pair res = query(toQuery);
        for (Pair p : nodesWithDist) {
            if (p.d-1 == res.n) return p.n;
        }
        return -1;
    }

    void findNodesWithDist(int n, int p, int d) {
        if (d == minDist) {
            nodesWithDist.add(new Pair(n, n+1));
        }
        for (int e : adj[n]) {
            if (e != p) findNodesWithDist(e, n, d+1);
        }
    }

    int findCentroid() {
        stSize = new int[N];
        genSTSizes(0, 0);
        int n = 0, p = 0;
        boolean moved = true;
        while (moved) {
            moved = false;
            for (int e : adj[n]) {
                if (e == p) continue;
                if (stSize[e] > N / 2) {
                    p = n;
                    n = e;
                    moved = true;
                    break;
                }
            }
        }
        return n;
    }

    int[] stSize;
    void genSTSizes(int n, int p) {
        stSize[n] = 1;
        for (int e : adj[n]) {
            if (e != p) {
                genSTSizes(e, n);
                stSize[n] += stSize[e];
            }
        }
    }

    Pair check(int d) {
        ArrayList<Integer> toQuery = new ArrayList<>(2);
        for (int i = 0; i < N; i++) {
            if (depth[i] >= d) toQuery.add(i+1);
        }
        return query(toQuery);
    }

    Pair query(ArrayList<Integer> toQuery) {
        System.out.printf("? %d", toQuery.size());
        for (int q : toQuery) System.out.printf(" %d", q);
        System.out.println();
        System.out.flush();

        try {
            StringTokenizer st = new StringTokenizer(in.readLine());
            return new Pair(Integer.parseInt(st.nextToken()) - 1, Integer.parseInt(st.nextToken()));
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    void genTreeInfo(int n, int p) {
        depth[n] = depth[p] + 1;
        maxDepth = Math.max(depth[n], maxDepth);
        for (int e : adj[n]) {
            if (e != p) genTreeInfo(e, n);
        }
    }

    static class Pair {
        int n, d;
        Pair(int n, int d) {
            this.n = n;
            this.d = d;
        }
    }

    public static void main(String[] args) throws IOException {
        in = new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(in.readLine());
        for (int i = 0; i < T; i++) new hiddenpair();
        in.close();
    }
}