func main()
	var t: int :: cui@inputInt()
	for(1, t)
		var n: int :: cui@inputInt()
		var m: int :: cui@inputInt()
		for(1, m)
			var a: int :: cui@inputInt()
			var b: int :: cui@inputInt()
		end for
		var ans: bool :: n <> 1
		do cui@print((ans ?("Yes", "No")) ~ "\n")
	end for
end func