import sys
input = sys.stdin.readline

N, Q = map(int, input().split())
a = list(map(int, input().split()))
X = 0

for ai in a:
    X ^= ai

left = [0]

for ai in a:
    left.append(left[-1]^ai)

right = [0]

for ai in a[::-1]:
    right.append(right[-1]^ai)

for _ in range(Q):
    l, r = map(int, input().split())
    print(X^left[l-1]^right[N-r])