num = raw_input()
i=1
while i<=int(num):
	n = map(int,raw_input().strip().split())
	hua=[]
	diao=[]
	for j in range(n[0]):
		t = map(int,raw_input().strip().split())
		for k in range(t[0],t[1]+1):
			if not(k in hua):hua.append(k)
	for j in range(n[1]):
		t = map(int,raw_input().strip().split())
		for k in range(t[0],t[1]+1):
			if not(k in diao):diao.append(k)		
	sum=0
	for j in hua:
		for k in diao:
			if j==k: sum+=1
	print sum