#!/usr/bin/env python3
import sys


def main():
    # N = int(input())
    N, Q = map(int,input().split())
    A = list(map(int,input().split()))
    xA = [0]
    for aa in A:
        xA.append(xA[-1] ^ aa)
    xA.pop(0)
    for _ in range(Q):
        l, r = map(int,input().split())
        if l - 1 == 0:
            print(xA[r - 1])
        else:
            print(xA[l - 2] ^ xA[r - 1])
    return

if __name__ == '__main__':
    main()