N, Q = gets.split(" ").map{|s| s.to_i}
a = gets.split(" ").map{|s| s.to_i}

q = []
Q.times {
	q << gets.split(" ").map{|s| s.to_i}
}

s = [0]
a.each {|x|
	s << s[-1] ^ x
}

ans = []
q.each {|l, r|
	ans << s[l-1] ^ s[r]
}

puts ans