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

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