#include <bits/stdc++.h>
using namespace std;
int main(){
int t, n, sum, op;
cin >> t;
vector<int> a;
set<int> sums;
vector<vector<map<int, bool> > > psbl;
vector<bool> k;
while (t--){
cin >> n;
a.resize(n);
vector<vector<map<int, bool> > > psbl(n, vector<map<int, bool> >(n));
k.assign(n+1, true);
k[0] = false;
k[1] = false;
for (int i=0; i<n; i++){
cin >> a[i];
}
for (int i=0; i<n; i++){
psbl[i][i][0] = true;
psbl[i][i][a[i]] = true;
sum = a[i];
for (int j=i+1; j<n; j++){
for (auto x : psbl[i][j-1]){
if (!x.second) continue;
psbl[i][j][x.first] = true;
if (x.first + a[j] <= 50000){
psbl[i][j][x.first + a[j]] = true;
}
}
sum += a[j];
if (sum % 2 || !psbl[i][j][sum/2]){
k[j-i+1] = false;
}
}
}
op = 0;
for (int x : k){
if (x){
op++;
}
}
cout << op << " ";
for (int i=1; i<n+1; i++){
if (k[i]){
cout << i << " ";
}
}
cout << "\n";
}
return 0;
}
