#include <bits/stdc++.h>
#define nn '\n'
#define int long long
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define vec vector
using namespace std;
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
cin >> t;
while (t--) {
int n;
cin >> n;
vector<int> a(n), p(n + 1);
for (int i = 0; i < n; ++i) cin >> a[i];
for (int i = 0; i < n; ++i) p[i + 1] = p[i] + a[i];
vec<int> res;
for (int i = 2; i <= n; ++i) {
bool ok = true;
for (int j = 0; j + i <= n; ++j) {
int r = i + j;
int sum = p[r] - p[j];
if (sum % 2 != 0) {
ok = false;
break;
}
int cnt = sum / 2;
vector<bool> dp(cnt + 1, false);
dp[0] = true;
for (int k = j; k < r; ++k) {
for (int h = cnt; h >= a[k]; --h) {
if (dp[h - a[k]] ) {
dp[h] = true;
}
}
}
if (!dp[cnt]) {
ok = false;
break;
}
}
if (ok) res.pb(i);
}
cout << res.size();
for (int x : res) cout << ' ' << x;
cout << nn;
}
}
