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