#include <bits/stdc++.h>
#define F first
#define S second
#define ll long long
#define int long long
#define pb push_back
#define all(x) (x.begin(),x.end())
#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define double long double
using namespace std;
const ll N = 3e5+7, INF = 1e14, inf = 1e9 , mod = 1e9+7;
int a[N];
bool good[N];
int dp[N];
int pref[N];
signed main(){
ios;
int tt;
cin>>tt;
while(tt--){
int n;
cin>>n;
for(int i=1;i<=n;i++){
cin>>a[i];
pref[i]=pref[i-1]+a[i];
}
for(int i=1;i<=n;i++){
for(int x=pref[n];x>=1;x--){
dp[x+a[i]]=max(dp[x+a[i]],dp[x]);
}
dp[a[i]]=i;
for(int k=2;k<=i;k++){
int sum=(pref[i]-pref[i-k]);
if(sum%2==1 || dp[sum/2]<i-k+1)good[k]=1;
}
}
vector<int>ans;
for(int i=2;i<=n;i++){
if(good[i]==0)ans.pb(i);
good[i]=0;
}
cout<<ans.size()<<" ";
for(auto to:ans)cout<<to<<" ";
cout<<'\n';
for(int i=1;i<=2e5;i++)dp[i]=0;
}
}
