#include<bits/stdc++.h>
using namespace std;

#define int long long
const int MOD=1e9+7;
const int INF=1e18;

int bin_pow(int a, int b){
    int ans=1;
    while(b){
        if(b&1){
            ans*=a;
        }
        a*=a;
        b>>=1;
    }
    return ans;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        cout<<"? 1 1"<<endl;
        vector<int> v;
        int x, y;
        cin>>x>>y;
        v.push_back(x);
        int l=1, r=3;
        while(true){
            cout<<"? "<<l<<" "<<min(n,r)<<endl;
            int a, b;
            cin>>a>>b;
            if(r<n){
                if(v[l-1]==1){
                    if(a==1){
                        v.push_back(0);
                        v.push_back(0);
                    }
                    else if(a==2){
                        if(b==0){
                            v.push_back(0);
                            v.push_back(1);
                        }
                        else{
                            v.push_back(1);
                            v.push_back(0);
                        }
                    }
                    else if(a==3){
                        v.push_back(1);
                        v.push_back(1);
                    }
                }
                else{
                    if(a==0){
                        v.push_back(0);
                        v.push_back(0);
                    }
                    else if(a==1){
                        if(b==0){
                            v.push_back(1);
                            v.push_back(0);
                        }
                        else{
                            v.push_back(0);
                            v.push_back(1);
                        }
                    }
                    else if(a==2){
                        v.push_back(1);
                        v.push_back(1);
                    }
                }
                l+=2;
                r+=2;
            }
            else{
                if(r==n){
                    if(v[l-1]==1){
                        if(a==1){
                            v.push_back(0);
                            v.push_back(0);
                        }
                        else if(a==2){
                            if(b==0){
                                v.push_back(0);
                                v.push_back(1);
                            }
                            else{
                                v.push_back(1);
                                v.push_back(0);
                            }
                        }
                        else if(a==3){
                            v.push_back(1);
                            v.push_back(1);
                        }
                    }
                    else{
                        if(a==0){
                            v.push_back(0);
                            v.push_back(0);
                        }
                        else if(a==1){
                            if(b==0){
                                v.push_back(1);
                                v.push_back(0);
                            }
                            else{
                                v.push_back(0);
                                v.push_back(1);
                            }
                        }
                        else if(a==2){
                            v.push_back(1);
                            v.push_back(1);
                        }
                    }
                }
                else if(r==n+1){
                    if(v[l-1]==1){
                        if(a==1){
                            v.push_back(0);
                        }
                        else if(a==2){
                            v.push_back(1);
                        }
                    }
                    else{
                        if(a==0){
                            v.push_back(0);
                        }
                        else if(a==1){
                            v.push_back(1);
                        }
                    }
                }
                break;
            }
        }
        vector<int> ans;
        for(int i=0; i<n; i++) if(v[i]==1) ans.push_back(i+1);
        cout<<"! "<<ans.size()<<' ';
        for(auto it:ans) cout<<it<<" ";
        cout<<endl;
    }
}