import java.io.*;
import java.util.*;

public class A {

	BufferedReader br;
	PrintWriter out;
	StringTokenizer st;
	boolean eof;
	
	int getMin(int[] a) {
		int ret = Integer.MAX_VALUE;
		for (int x : a) {
			ret = Math.min(ret, x);
		}
		return ret;
	}
	
	int getMax(int[] a) {
		int ret = Integer.MIN_VALUE;
		for (int x : a) {
			ret = Math.max(ret, x);
		}
		return ret;
	}
	
	long getMin(int[] xs, int[] ys, int vx, int vy) {
		long ret = Long.MAX_VALUE;
		for (int i = 0; i < xs.length; i++) {
			long val = (long)xs[i] * vx + (long)ys[i] * vy;
			ret = Math.min(ret, val);
		}
		return ret;
	}
	
	boolean good(int[] xs, int[] ys, int n, int dx, int dy) {
		int ex = -dy;
		int ey = dx;
		
		long minD = getMin(xs, ys, dx, dy);
		long maxD = -getMin(xs, ys, -dx, -dy);
		
		long minE = getMin(xs, ys, ex, ey);
		long maxE = -getMin(xs, ys, -ex, -ey);
		
		if (minD == maxD || minE == maxE) {
			return false;
		}
		
		for (int i = 0; i < n; i++) {
			long vD = (long)xs[i] * dx + (long)ys[i] * dy;
			long vE = (long)xs[i] * ex + (long)ys[i] * ey;
			if (!(vD == minD || vD == maxD || vE == minE || vE == maxE)) {
				return false;
			}
		}
		return true;
	}

	void solve() throws IOException {
		int n = nextInt();
		int[] xs = new int[n];
		int[] ys = new int[n];
		
		for (int i = 0; i < n; i++) {
			xs[i] = nextInt();
			ys[i] = nextInt();
		}
		
		if (n <= 3) {
			out.println("YES");
			return;
		}
		
		int cnt = 0;
		
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				int dx = xs[j] - xs[i];
				int dy = ys[j] - ys[i];
				
				if (dx == 0 && dy == 0) {
					continue;
				}
				
				cnt++;
				if (good(xs, ys, n, dx, dy)) {
					out.println("YES");
					return;
				}
			}
		}
		
		out.println(cnt == 0 ? "YES" : "NO");
		
	}

	A() throws IOException {
		br = new BufferedReader(new InputStreamReader(System.in));
		out = new PrintWriter(System.out);
		int q = nextInt();
		while (q-- > 0) {
			solve();
		}
		out.close();
	}

	public static void main(String[] args) throws IOException {
		new A();
	}

	String nextToken() {
		while (st == null || !st.hasMoreTokens()) {
			try {
				st = new StringTokenizer(br.readLine());
			} catch (Exception e) {
				eof = true;
				return null;
			}
		}
		return st.nextToken();
	}

	String nextString() {
		try {
			return br.readLine();
		} catch (IOException e) {
			eof = true;
			return null;
		}
	}

	int nextInt() throws IOException {
		return Integer.parseInt(nextToken());
	}

	long nextLong() throws IOException {
		return Long.parseLong(nextToken());
	}

	double nextDouble() throws IOException {
		return Double.parseDouble(nextToken());
	}
}