func main()
	var n: int :: cui@inputInt()
	var x: []int :: [2, 3, 7]
	var y: []int :: [8, 9, 9]
	for(1, n)
		var x1: int :: cui@inputInt()
		var y1: int :: cui@inputInt()
		var x2: int :: cui@inputInt()
		var y2: int :: cui@inputInt()
		for i(0, 2)
			if(x[i] = x1 & y[i] = y1)
				do x[i] :: x2
				do y[i] :: y2
			end if
		end for
	end for
	var ans: bool :: x[0] = 5 & x[1] = 4 & x[2] = 6 & y[0] = 8 & y[1] = 8 & y[2] = 8
	do cui@print(ans ?("YES\n", "NO\n"))
end func