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