def main():
    N, Q = map(int, input().split())
    a = list(map(int, input().split()))
    partial_xor = [0]
    for elm in a:

        partial_xor.append(partial_xor[-1] ^ elm)

    for _ in range(Q):
        l, r = map(int, input().split())
        print(partial_xor[l-1] ^ partial_xor[r])


if __name__ == "__main__":
    main()