import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, Q = getlist()
	A = getlist()
	XOR = [0]
	for i in range(N):
		XOR.append(XOR[-1] ^ A[i])

	for i in range(Q):
		l, r = getlist()
		l -= 1; r -= 1
		ans = XOR[l] ^ XOR[r + 1]
		print(ans)

if __name__ == '__main__':
	main()