#include <bits/stdc++.h>
using namespace std;
const int MAXN = 100001;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int tt;
cin >> tt;
while(tt--) {
int n;
cin >> n;
vector<int> a(n + 1);
for(int i = 1; i <= n; i++) {
cin >> a[i];
}
function<int(int, int)> can = [&](int l, int r) {
int sum = 0;
for(int i = l; i <= r; i++) {
sum += a[i];
}
if(sum % 2) {
return 0;
}
bitset<MAXN> b;
b[0] = 1;
for(int i = l; i <= r; i++) {
b |= (b << a[i]);
}
int w = b[sum / 2];
return w;
};
vector<int> ans;
for(int k = 1; k <= n; k++) {
int ok = 1;
for(int i = 1; i + k - 1 <= n; i++) {
ok &= can(i, i + k - 1);
}
if(ok) {
ans.push_back(k);
}
}
cout << ans.size() << " ";
for(auto x : ans) {
cout << x << " ";
}
cout << "\n";
}
}
