T=int(raw_input())
while T>0:
	a,b =map(int,raw_input().strip().split())
	hlist=[]
	for i in range(a):
		s1,s2=map(int,raw_input().strip().split())
		for v in range(s1,s2+1):
			hlist.append(v)
		
	dlist=[]
	for i in range(b):
		s1,s2=map(int,raw_input().strip().split())
		for v in range(s1,s2+1):
			dlist.append(v)
	c=0
	for i in range(len(dlist)):
		if hlist.count(dlist[i])>0:
			c=c+1
	print c
	T-=1