a=[[2,8],[3,9],[7,9]]
b=[[5,8],[4,8],[6,8]]
gets.to_i.times{
	e=gets.split(" ").map{|e| e.to_i}
	c=a.index(e[0,2])
	a[c]=e[2,2] if c!=nil
}
puts (a==b)?("YES"):("NO")