#include <iostream>
using namespace std;
const int MOD = 1000000007;
const int MAXN = 1000;
const int MAXSUM = 100000;
int v[MAXN + 1], rucsac[MAXSUM / 2 + 1], answer[MAXN + 1], sp[MAXN + 1];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int t;
cin >> t;
while(t--) {
int n;
cin >> n;
for(int i = 1; i <= n; i++) {
cin >> v[i];
answer[i] = 1;
sp[i] = sp[i - 1] + v[i];
}
for(int i = 0; i <= sp[n] / 2; i++) {
rucsac[i] = 0;
}
for(int i = 1; i <= n; i++) {
for(int j = sp[n] / 2; j > v[i]; j--) {
rucsac[j] = max(rucsac[j], rucsac[j - v[i]]);
}
rucsac[v[i]] = i;
for(int k = 2; k <= i; k++) {
if((sp[i] - sp[i - k]) % 2 || rucsac[(sp[i] - sp[i - k]) / 2] <= i - k) {
answer[k] = 0;
}
}
}
int cnt = 0;
for(int i = 2; i <= n; i++) {
cnt += answer[i];
}
cout << cnt << " ";
for(int i = 2; i <= n; i++) {
if(answer[i]) {
cout << i << " ";
}
}
cout << "\n";
}
return 0;
}
