l_z = input()
wyniki = []
for z in range(int(l_z)):
    b1 = input()
    l_1 = [int(x) for x in input().split()]
    b2 = input()
    l_2 = [int(x) for x in input().split()]

    wynik = []

    for i in range(2):
        l_1.insert(0, 0)
        l_2.insert(0, 0)

    if int(b2) > int(b1):
        for a in range(int(b2) - int(b1)):
            l_1.insert(0, 0)

    if int(b1) > int(b2):
        for a in range(int(b1) - int(b2)):
            l_2.insert(0, 0)

    ind = (len(l_1) - 1)

    for x in range(int(ind)):
        num_sum = (l_1[int(ind)] + l_2[int(ind)])

        if num_sum == 0 or num_sum == 2:
            wynik.insert(0, 0)
            if num_sum == 2:
                l_1[int(ind) - 1] += 1
            ind -= 1

        elif num_sum == 1 or num_sum == 3:
            wynik.insert(0, 1)
            if num_sum == 3:
                l_1[int(ind) - 1] += 1
            ind -= 1

    while 1 in wynik and wynik[0] == 0:
        del wynik[0]
    if 1 not in wynik:
        wynik = [0]
    wyniki.append(wynik)
    wynik = []

for l in range(len(wyniki)):
    print(''.join(str(x) for x in wyniki[l]))