/*
██████╗ █████╗ ███████╗██╗ ██╗██╗██████╗
██╔══██╗██╔══██╗██╔════╝██║ ██║██║██╔══██╗
██████╔╝███████║███████╗███████║██║██║ ██║
██╔══██╗██╔══██║╚════██║██╔══██║██║██║ ██║
██║ ██║██║ ██║███████║██║ ██║██║██████╔╝
╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝╚═╝ ╚═╝╚═╝╚═════╝
*/
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ll long long
#define ull unsigned long long
#define ld long double
#define str string
#define ch char
#define db double
#define pb push_back
#define ff first
#define ss second
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define YES cout<<"YES\n";
#define NO cout<<"NO\n";
#define Bob cout<<"Bob\n";
#define Alice cout<<"Alice\n";
#define ordered_set tree<pair<ll, ll>, null_type,less<pair<ll,ll>>,rb_tree_tag,tree_order_statistics_node_update>
const ll MOD=1e9+7;
const ll INF = 10000000000;
bool duzdu(vector<ll>subarray){
ll sum = 0;
for(auto p : subarray)sum+=p;
if(sum%2!=0)return false;
vector<bool>dp((sum/2)+1,false);
dp[0]=true;
for(auto p : subarray){
for(ll i = sum/2;i>=p;i--){
if(dp[i-p]){
dp[i]=true;
}
}
if(dp[sum/2])return true;
}
return dp[sum/2];
}
void solve(){
ll n;
cin>>n;
vector<ll>v(n);
for(int i = 0;i<n;i++){
cin>>v[i];
}
vector<ll>ans;
for(ll k = 1;k<=n;k++){
bool ok = true;
for(ll i = 0;i<=n-k;i++){
vector<ll>alma;
for(ll j = i;j<i+k;j++){
alma.pb(v[j]);
}
if(!duzdu(alma)){
ok=false;
break;
}
}
if(ok){
ans.pb(k);
}
}
cout<<ans.size()<<" ";
for(auto p : ans)cout<<p<<" ";
cout<<"\n";
}
signed main(){
ll t=1;
cin>>t;
while(t--){
solve();
}
return 0;
}
