#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);
for (int i = 0; i < n; ++i) cin >> a[i];
vector<int> res;
for (int i = 2; i <= n; ++i) {
bool ok = true;
for (int j = 0; j + i <= n; ++j) {
vector<int> v(a.begin() + j, a.begin() + i + j);
int sum = accumulate(all(v), 0LL);
if (sum % 2 != 0) {
ok = false;
break;
}
int cnt = sum / 2;
vector<bool> dp(cnt + 1, false);
dp[0] = true;
for (int l = 0 ; l < v.size(); l++) {
for (int k = cnt; k >= v[l]; --k) {
if (dp[k - v[l]]) dp[k] = true;
}
}
if (!dp[cnt]) {
ok = false;
break;
}
}
if (ok) res.pb(i);
}
cout << res.size();
for (int x : res) cout << ' ' << x;
cout << nn;
}
}
