def rddata(n):
	a = [0 for i in range(24)]
	for i in range(n):
		s,e = list(map(int,input().split()))
		for j in range(s,e+1):
			a[j] = 1
	return a;
ncase = int(input())
for t in range(ncase):
	n,m = list(map(int,input().split())) 
	a,b=rddata(n),rddata(m)
	sum=0
	for i in range(24):
		if a[i] == 1 and b[i] == 1:
			sum += 1
	print(sum)