#include <bits/stdc++.h>
using namespace std;
const int MAXN = 100001;
bitset<MAXN> b;
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];
}
a[0] = 0;
vector<int> ans;
vector<int> can(n + 1, 1);
for(int i = 1; i <= n; i++) {
b[0] = 1;
int sum = 0;
vector<int> to_reset;
for(int k = i; k <= n; k++) {
b |= (b << a[k]);
sum += a[k];
if(sum % 2) {
can[k - i + 1] = 0;
continue;
}
if(! b[sum / 2]) {
can[k - i + 1] = 0;
continue;
}
}
b.reset();
}
for(int k = 1; k <= n; k++) {
if(can[k]) {
ans.push_back(k);
}
}
cout << ans.size() << " ";
for(auto x : ans) {
cout << x << " ";
}
cout << "\n";
}
}
