for t in range(int(input())):
    ls = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
    num = 0
    n,m = map(int,input().split())
    for i in range(n):
        a,b = map(int,input().split())
        for j in range(a,b+1):
            ls[j] = 1
    for i in range(m):
        a,b = map(int,input().split())
        for j in range(a,b+1):
            if(ls[j] == 1):
                num = num + 1
    print(num)