T=input()
list1=[]
list2=[]
for i in range(T):
	count =0
	n,m = map(int,raw_input().strip().split())
	for j in range(n):
		a,b = map(int,raw_input().strip().split())
		for k in range(a,b+1):
			if k not in list1:
				list1.append(k)
	for j in range(m):
		a,b = map(int,raw_input().strip().split())
		for k in range(a,b+1):
			if k not in list2:
				list2.append(k)
	for testN in list1:
		if testN in list2:
			count=count+1
	list1=[]
	list2=[]
	print count