#include <bits/stdc++.h>
using ll = long long;
using uint = unsigned;
using namespace std;

const int mxn = 2e5 + 10;

int TestCase, f[mxn][3];

signed main() {
	for (scanf("%d", &TestCase); TestCase--;) {
		int n;
		scanf("%d", &n);
		vector<int> a(n);
		for (int &x : a) scanf("%d", &x);
		for (int i = 0; i <= n; ++i) memset(f[i], 0, sizeof f[i]);
		f[0][1] = f[1][a[0] * 2] = 1;
		for (int i = 2; i <= n; ++i) {
			if (a[i - 1] == a[i - 2])
				for (int k = 0; k < 3; ++k) f[i][k] |= f[i - 1][k];
			else f[i][1] |= f[i - 2][1];
			if (a[i - 1] == 0) {
				f[i][0] |= f[i - 1][0];
				f[i][1] |= f[i - 1][2];
			} else {
				f[i][1] |= f[i - 1][0];
				f[i][2] |= f[i - 1][2];
			}
		}
		puts(f[n][1] ? "Yes" : "No");
	}
	return 0;
}