#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 1e5 + 11;
const int inf = 1e18;
int a[N];
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
int T = 1;
cin >> T;
while(T--){
int n;
cin >> n;
for(int i = 1; i <= n; i++){
cin >> a[i];
}
bitset < N > oh;
vector < int > ans;
for(int k = 1; k <= n; k++){
int l = 1, sum = 0, ok = 1;
oh &= 0;
oh[0] = 1;
for(int r = 1; r <= n; r++){
oh |= (oh << a[r]);
sum += a[r];
while(r - l + 1 > k){
sum -= a[l];
oh >>= a[l];
l++;
}
if(r - l + 1 == k && (oh[sum / 2] == 0 || sum&1)){
ok = 0;
}
}
if(ok) ans.push_back(k);
}
cout << ans.size() << ' ';
for(int i: ans) cout << i << ' ';
cout << '\n';
}
}
// hello karim nurbakyt sanzhar azamat congratulation europa asia america laplas
