for t in range(input()) :
	L = [raw_input() for i in range(input())]
	if ("cakewalk" in L) and ("simple" in L) and ("easy" in L) and (("easy-medium" in L) or ("medium" in L)) and (("medium-hard" in L) or ("hard" in L)) :
		print "Yes"
	else : print "No"