#include<iostream>
#include<cstdio>
#include<map>
#include<cstring>
using namespace std;
typedef pair<int,int> PII;
const int MX=2550;
const int MZ=10000;

int T, N, M, cnt;
int now=0, num=0, pre=0, nm=0;
int id[MX], fa[MX];
bool g[MX][MX]; 
int k[MX][MX];
PII ans[4*MZ];
int read()
{
    int r=0, f=1; char ch=getchar();
    while(ch<'0'||ch>'9') {if(ch=='-') f=-1; ch=getchar();}
    while(ch>='0'&&ch<='9') {r=r*10+ch-'0'; ch=getchar();}
    return r*f;
}
void ask(int e)
{
    cout << "> " << e << '\n';
    cout.flush(); 
    pre=now, nm=num; 
    cin >> now >> num;
    k[pre][now]=e;
    if(!fa[now]) fa[now]=pre;
    if(!g[now][pre]) g[now][pre]=g[pre][now]=1, ans[++cnt]={now,pre};
}
int main()
{
    // freopen("testdata.in","r",stdin);
    cin >> T;
    while(T--)
    {  
        cnt=0; 
        cin >> now >> num;
        fa[1]=-1;
        while(now!=1||id[now]!=num)
        {
            if(id[now]==num) //full size return
            {
                ask(k[now][fa[now]]);
                continue;
            }
            ask(++id[now]);    
            if(fa[pre]==now) //tree edge return
                ask(k[now][pre]);
        }
        cout << "! ";
        for(int i=1;i<=cnt;i++)
        {
            auto [u,v]=ans[i];
            cout << u << " " << v << " "; 
            fa[u]=fa[v]=id[u]=id[v]=0;
            g[u][v]=g[v][u]=k[v][u]=k[u][v]=0;
        } 
        cout << '\n';
        cout.flush();
        string s; cin >> s;
    }
    return (0-0);
}