#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t;
cin >> t;
while(t--) {
int n;
cin >> n;
int a[n], pref[n+1], sm;
for(int i = 0; i < n; i++) cin >> a[i];
pref[0] = 0;
for(int i = 0; i < n; i++) pref[i+1] = pref[i]+a[i];
sm = pref[n]/2;
vector<int> ans;
bool dp[n][n][sm+1];
for(int i = 0; i < n; i++) {
for(int j = 0; j <= sm; j++) {
if(j == 0 || j == a[i]) dp[i][i][j] = 1;
else dp[i][i][j] = 0;
}
for(int j = i+1; j < n; j++) {
for(int k = 0; k <= sm; k++) {
if(dp[i][j-1][k] == 1 || (a[j] <= k && dp[i][j-1][k-a[j]] == 1)) dp[i][j][k] = 1;
else dp[i][j][k] = 0;
}
}
}
for(int i = 0; i < n; i++) {
for(int j = 0; j < n-i; j++) {
sm = pref[j+i+1]-pref[j];
if(sm % 2 == 1 || dp[j][j+i][sm/2] == 0) {
goto ed;
}
}
ans.push_back(i+1);
ed:;
}
cout << ans.size() << " ";
for(int i : ans) cout << i << " ";
cout << '\n';
}
}
