#include<iostream> #include<vector> using namespace std; int N,A[2<<17]; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int T; cin>>T; for(;T--;) { cin>>N; for(int i=0;i<N;i++)cin>>A[i]; vector<pair<int,int> >a; for(int i=0;i<N;i++) { if(a.empty()||a.back().first!=A[i])a.push_back(make_pair(A[i],1)); else a.back().second++; } if(a.size()==1) { cout<<"No\n"; continue; } else if(a.size()%2==0) { cout<<"Yes\n"; continue; } bool fn=a.size()>=9; for(int i=1;i<a.size();i+=2)if(a[i].second>=2)fn=true; cout<<(fn?"Yes\n":"No\n"); } }