N,Q=map(int,input().split())
a=[0]+list(map(int,input().split()))
x=[0]
for i in range(1,N+1):
    x.append(x[-1]^a[i])
#print(x)
for i in range(Q):
    s,e=map(int,input().split())
    print(x[e]^x[s-1])