n, q = map(int, input().split())
a = list(map(int, input().split()))
s = [0] * (n + 1)
for i in range(n):
    s[i + 1] = s[i] ^ a[i]
for i in range(q):
    l, r = map(int, input().split())
    print(s[l - 1] ^ s[r])