n, q = [int(v) for v in input().split()]
a = [0]
b = [int(v) for v in input().split()]
for i in range(n):
    a.append(a[-1] ^ b[i])

for i in range(q):
    l, r = [int(v) for v in input().split()]
    print(a[l - 1] ^ a[r])