#yuki1091
n,q=map(int,input().split())
a=list(map(int,input().split()))
b=[0]*(n+1)
for i in range(n):
 b[i+1]=b[i]^a[i]
for i in range(q):
 l,r=map(int,input().split())
 print(b[r]^b[l-1])
print()