/*
Telebe of Adicto && Mamedov yani AzeTurk810
I see humans but no humanity
*/
#include <algorithm>
#include <cassert>
#include <functional>
#include <iostream>
#include <vector>
// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
using ll = long long;
using namespace std;
#define ln '\n'
#define INFi 1e9
#define INFll 1e18
#ifdef ONPC
#include <algo.hpp>
#else
#define dbg(...)
#define dbg_out(...)
#endif
constexpr int up = 1000 + 505, upA = 100000 + 505;
int dp[up][upA];
bool ok(vector<int> v) {
int sum1 = 0, sum2 = 0, sum = 0;
for (const int &v : v)
sum += v;
sort(v.begin(), v.end(), greater<>());
int r = v.size() - 1;
for (int i = 0; i <= r;) {
if (sum1 > sum2) {
sum2 += v[i];
} else {
sum1 += v[i];
}
i++;
if (i <= r) {
if (sum1 + v[r] == sum2) {
sum1 += v[r--];
} else if (sum2 + v[r] == sum1) {
sum2 += v[r--];
}
}
}
cerr << sum1 << ' ' << sum2 << ln;
return (bool)(sum1 == sum2);
}
char solve() {
int N;
if (!(cin >> N))
return 1;
vector<int> A(N + 1), pref(N + 1), ans;
for (int i = 1; i <= N; i++)
cin >> A[i];
// dbg(A);
for (int i = 1; i <= N; i++) {
pref[i] = pref[i - 1] + A[i];
}
// dbg(pref);
for (int i = 1; i <= N; i++) {
for (int j = 1; j <= pref[N]; j++) {
dp[i][j] = dp[i - 1][j];
if (j == A[i]) {
dp[i][j] = max(i, dp[i][j]);
}
if (j - A[i] >= 0) {
dp[i][j] = max(dp[i - 1][j - A[i]], dp[i][j]);
}
// cerr << i << ' ' << j << ' ' << dp[i][j] << ln;
}
}
for (int sz = 2; sz <= N; sz++) {
char flag = true;
for (int l = 1; l <= N - sz + 1; l++) {
dbg(sz);
dbg(l);
int r = l + sz - 1;
assert(r - l + 1 == sz);
assert(r <= N);
ll sum = pref[r] - pref[l - 1];
if ((sum & 1) || ((dp[r][sum >> 1]) < l)) {
dbg(dp[r][(pref[r] - pref[l - 1])/2]);
dbg(l);
dbg(sum);
flag = false;
break;
}
}
if (flag) {
ans.push_back(sz);
}
}
cout << ans.size() << ' ';
for (const int &a : ans) {
cout << a << ' ';
}
cout << ln;
return 0;
}
// Attack on titan<3
signed main() {
ios::sync_with_stdio(0);
cin.tie(nullptr);
int t = 1e9;
cin >> t;
for (int cases = 0; cases < t; cases++) {
if (solve())
break;
#ifdef ONPC
cerr << "__________\n";
#endif
}
}
// Just Imaginary
/*
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣀⠀⠀⠀⢀⣴⣾⠀⠀⠀⡀⢀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⣿⣦⣾⣿⣿⣿⣿⣿⡆⠁⠀⢀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⣿⣿⣿⣿⣿⣿⣿⣿⡿⠁⠀⡠⠂⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠠⠔⠚⣿⣿⣿⣿⣿⣦⡄⠀⠁⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⢀⠠⠐⢂⠉⡀⣀⣤⣄⢻⣿⣿⡟⢈⡹⣿⡀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⡀⠄⠂⠈⠀⣶⣤⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠘⣷⡀⠀⡀⠐⠂⠐⢄
⠀⠀⠀⠀⠀⠀⠀⣿⣿⠟⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣧⣀⣾⣷⠯⠀⠤⠤⠄⠈
⠀⠀⠀⠀⠀⠀⣼⣿⡟⠀⠀⣹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣄⡀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⣰⣿⠋⠀⠀⢠⣾⣿⣿⣿⣿⣿⣭⠟⢻⣿⣿⣿⣿⡿⠁⠀⠀⠀⠀
⠀⠀⠀⣀⣶⡟⠁⠀⢾⣶⣿⠟⠉⠈⢻⣿⣿⣿⣦⣜⠀⠛⠛⠿⠁⠀⠀⠀⠀⠀
⠚⠻⠿⠿⡿⠁⠀⢠⣿⣿⠁⠀⣠⠖⠋⠉⠻⣿⣿⣿⣶⡀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⣰⣿⡿⠃⠠⠊⠁⠀⠀⠀⠀⠈⢿⣿⣿⠟⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢀⣴⡿⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⣠⣾⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢀⣴⠾⠟⠛⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
*/
