#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
void testCase(){
int n, total = 0;
cin >> n;
vector<int> a(n + 1, 0);
for(int i = 1; i <= n; ++i){
cin >> a[i];
total += a[i];
}
vector<vector<int>> dp(n + 5, vector<int>(total + 5, 0));
total /= 2;
for(int i = 1; i <= n; ++i){
dp[i][a[i]] = i;
for(int j = 1; j <= total; ++j){
dp[i][j] = max(dp[i][j], dp[i - 1][j]);
if(a[i] <= j) dp[i][j] = max(dp[i][j], dp[i - 1][j - a[i]]);
}
}
for(int i = 1; i <= n; ++i) a[i] += a[i - 1];
vector<int> ans;
for(int len = 2; len <= n; ++len){
bool flag = 1;
for(int i = 1; i <= n - len + 1; ++i){
int sum = a[i + len - 1] - a[i - 1];
if(sum & 1 || dp[i + len - 1][sum >> 1] < i){
flag = 0;
break;
}
}
if(flag) ans.push_back(len);
}
cout << (int) ans.size() << " ";
for(auto x : ans) cout << x << " ";
cout << "\n";
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int tc;
cin >> tc;
while(tc--) testCase();
return 0;
}
