c=int(input())
for k in range(c):
    h,d=map(int,input().split())
    d1,d2=[],[]
    for i in range(h):
        b,c=map(int,input().split())
        for j in range(b,c+1):
            if j not in d1:
                d1.append(j)
    for i in range(d):
        b,c=map(int,input().split())
        for j in range(b,c+1):
            if j not in d2:
                d2.append(j)
    count=0
    for i in d1:
        for j in d2:
            if i==j:
                count+=1
    print(count)