#!/usr/bin/env python3

import sys
input=sys.stdin.readline

n,q=map(int,input().split())
arr=list(map(int,input().split()))
total=0
for i in range(n):
    total^=arr[i]
acum_left=[0]
for i in range(n):
    acum_left.append(acum_left[-1]^arr[i])
acum_right=[0]
for i in range(n-1,-1,-1):
    acum_right.append(acum_right[-1]^arr[i])
acum_right=acum_right+[0]
acum_right=acum_right[::-1]
for _ in range(q):
    l,r=map(int,input().split())
    print(total^acum_left[l-1]^acum_right[r+1])