N,Q=map(int,input().split())
L=list(map(int,input().split()))
L=[0]+L+[0]
F=[0]
for i in range(1,len(L)):
    F.append(F[-1]^L[i])
#print(F)

E=[0 for i in range(len(F))]
for i in range(1,len(L)):
    E[len(L)-1-i]=E[len(L)-i]^L[len(L)-1-i]
#print(E)

for i in range(Q):
    l,r=map(int,input().split())
    print(F[-1]^F[l-1]^E[r+1])