n, q = read_line.split.map &.to_i
a = read_line.split.map &.to_i
a.unshift(0)
(1..n).each { |i| a[i] ^= a[i - 1] }
q.times do
  l, r = read_line.split.map &.to_i
  puts a[r] ^ a[l - 1]
end