#include<bits/stdc++.h>
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
bool ask(int x,int y){
    cout << "? " << x << ' ' << y << endl;
    char c;cin >> c;return (c=='<');
}

void solve(){
    int n;cin >> n;
    vector<int> a(2*n);
    iota(a.begin(),a.end(),1);
    shuffle(a.begin(),a.end(),rng);
    function<int(int,int)> get = [&](int l,int r){
        if(l+1==r) return a[l];
        int mid=(l+r)>>1;
        int x=get(l,mid),y=get(mid,r);
        if(x==-1) return y;
        else if(y==-1) return x;
        else return y+ask(x,y)*(x-y);
    };
    for(int i=0;i<n;i++){
        int id=get(0,2*n);
        for(int j=0;j<2*n;j++) if(a[j]==id) a[j]=-1;
        //a[id-1]=-1;
    }
    cout << "!" << endl;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    int test;cin >> test;
    while(test--) solve();
}