#include <stdio.h>

int main()
{
	int i, t, T, N, u, w, deg[100001];
	scanf("%d", &T);
	for (t = 1; t <= T; t++) {
		scanf("%d", &N);
		for (u = 1; u <= N; u++) deg[u] = 0;
		for (i = 0; i < N - 1; i++) {
			scanf("%d %d", &u, &w);
			deg[u]++;
			deg[w]++;
		}
		for (u = 1, i = 0; u <= N; u++) if (deg[u] == 1) i++;
		if (i <= (N - 1) / 2) printf("No\n");
		else printf("Yes\n");
	}
	fflush(stdout);
	return 0;
}