#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define pb push_back
#define S second
#define F first
#define pii pair<int,int>
#define vi vector <int>
#define vvi vector <vi>
#define vvvi vector <vvi>
#define INF LLONG_MAX
#define MOD 1000000009
#define MAXN 100000
using namespace std;
using namespace __gnu_pbds;
int32_t main() {
ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
int t;
cin>>t;
while (t--){
int n;
cin>>n;
int a[n+1];
int p[n+1];
p[0]=0;
for (int i=1;i<=n;i++){cin>>a[i];p[i]=p[i-1]+a[i];}
bitset<100001>b[n];
for (int i=1;i<n;i++)b[i][0]=1;
for (int i=1;i<n;i++){
b[i] |= (b[i]<<a[i]);
}
vi ans;
for (int k=2;k<=n;k++){
bool check=true;
for (int i=k;i<=n;i++){
b[i-k+1] |= (b[i-k+1]<<a[i]);
if ((p[i]-p[i-k])%2!=0)check=false;else
if (!b[i-k+1][(p[i]-p[i-k])/2])check=false;
}
if (check)ans.pb(k);
}
cout<<ans.size();
for (int x:ans)cout<<" "<<x;
cout<<"\n";
}
}
