t = int(input())
for _ in range(t):
    n, q = map(int,input().split())
    a = list(map(int,input().split()))
    lr = [list(map(int,input().split())) for _ in range(q)]

    if n>61:
        print(0)
        continue
    cur_val = a[0]
    for i in range(1,n):
        cur_val = (cur_val & a[i])<<1
    print(cur_val)