#include <bits/stdc++.h>
using namespace std;

void solve() {
	int n; cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; i ++) cin >> a[i];
	vector<pair<int, int>> b;
	for (int i = 0, j; i < n; i = j + 1) {
		j = i;
		while (j + 1 < n && a[j + 1] == a[i]) ++ j;
		b.push_back({ a[i], (j - i + 1) > 1 });
	}
	if (b.size() % 2 == 0) {
		cout << "Yes\n";
	} else {
		bool flag = false;
		for (int i = 1; i < b.size() - 1; i ++) if (b[i].second) flag = true;
		if (flag) cout << "Yes\n";
		else cout << "No\n";
	}
}

int main() {
	ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
	int tt; cin >> tt;
	while (tt --) solve();
	return 0;
}