author="jaykm"
q=input()
dgfqrg="fqwfwq"
dwfewr="fqwdfrqwe"
while(q>0):
    n=input()
    li=[]
    l1=[]
    l2=[]
    a,b =map(int, raw_input().split())
    li.append(a,b)
    l1.append(a)
    l2.append(b)
    
    x1=max(l1)
    x11=min(l1)
    x2=max(l2)
    x12=min(l2)
    
    ct=0
    for i in xrange(n):
        if li[i][0] != x1 and li[i][0] != x11  and li[i][1]!=x2 and li[i][1]!=x12:
            ct = 1
    if ct == 1:
        print "YES"
    else:
        print "NO"