#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pii=pair<int,int>;

#define all(a) a.begin(),a.end()
#define pb push_back
#define sz(a) ((int)a.size())

const int N=200005;
int n,a[N];

void ahcorz(){
    cin >> n;
    for(int i=0; i<n; ++i) cin >> a[i];
    if(a[0]^a[n-1]){
        cout << "Yes\n";
        return;
    }
    for(int i=0; i<n-1; ++i) if((a[i]^a[0])&&(a[i+1]^a[0])){
        cout << "Yes\n";
        return;
    }
    int cnt=0;
    for(int i=0; i<n; ++i) cnt+=a[0]^a[i];
    cout << (cnt>=4?"Yes":"No") << "\n";
}

signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    int t; cin >> t;
    while(t--) ahcorz();
}