#include "bits/stdc++.h"
using namespace std;
#ifdef duc_debug
#include "bits/debug.h"
#else
#define debug(...)
#endif
const int maxn = 1005;
const int N = 1e5 + 5;
int n, a[maxn];
bitset<N> bs, emp;
void solve() {
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> a[i];
}
vector<int> res;
for (int k = 2; k <= n; ++k) {
bs &= emp;
bs[0] = 1;
int sum = 0;
for (int i = 1; i < k; ++i) {
bs |= (bs << a[i]);
sum += a[i];
}
bool flag = 1;
for (int i = k; i <= n; ++i) {
if (i - k > 0) {
sum -= a[i - k];
bs &= (bs >> a[i - k]);
}
sum += a[i];
bs |= (bs << a[i]);
if (sum & 1 || !bs.test(sum / 2)) {
flag = 0;
break;
}
}
if (flag) {
res.push_back(k);
}
}
cout << (int)res.size() << " ";
for (auto i : res) cout << i << " ";
cout << '\n';
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int tt; cin >> tt;
while (tt--) {
solve();
}
return 0;
}
