N,Q=map(int,input().split())
A=[0]+list(map(int,input().split()))
for i in range(1,N+1):
    A[i]^=A[i-1]
for q in range(Q):
    l,r=map(int,input().split())
    l-=1
    ans=A[l]^A[r]
    print(ans)