using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;

namespace AtCoder.Contest.D
{
	static class Program
	{
		public static void Solve(Scanner cin)
		{
			int n = cin.ReadInt();
			int q = cin.ReadInt();
			var a = cin.ReadIntArray(n);
			var st = new Segtree<int>(n, (i, j) => i ^ j, 0);
			for (int i = 0; i < n; i++)
			{
				st.update(i, a[i]);
			}
			for (int i = 0; i < q; i++)
			{
				int l = cin.ReadInt() - 1;
				int r = cin.ReadInt() - 1;

				Console.WriteLine(st.run(l, r + 1));
			}
		}

		public static void Main(string[] args)
		{
			var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
			Console.SetOut(sw);
			var cin = new Scanner();
			Solve(cin);
			Console.Out.Flush();
		}
	}

	class Segtree<T>
	{
		int n;
		T[] tree;
		Func<T, T, T> f;
		T exnum;
		public Segtree(int m, Func<T, T, T> f, T ex)
		{
			this.f = f;
			this.exnum = ex;
			n = 1;
			while (n < m) n <<= 1;

			tree = new T[(n << 1) - 1];
			for (int i = 0; i < tree.Length; i++) tree[i] = ex;
		}
		public Segtree(int m, T ini, Func<T, T, T> f, T ex) : this(m, f, ex)
		{
			for (int i = 0; i < m; ++i) tree[i + n - 1] = ini;
			all_update();
		}
		public void assign_without_update(int j, T x)
		{
			tree[j + n - 1] = x;
		}
		public void update(int j, T x)
		{
			int i = j + n - 1;
			tree[i] = x;
			while (i > 0)
			{
				i = (i - 1) >> 1;
				tree[i] = f(tree[(i << 1) + 1], tree[(i << 1) + 2]);
			}
		}
		public void all_update()
		{
			for (int i = n - 2; i >= 0; i--)
				tree[i] = f(tree[(i << 1) + 1], tree[(i << 1) + 2]);
		}
		public T look(int i) { return tree[i + n - 1]; }

		// [s, t)
		public T run(int s, int t) { return query(s, t, 0, 0, n); }
		T query(int s, int t, int k, int l, int r)
		{
			if (r <= s || t <= l) return exnum;
			if (s <= l && r <= t) return tree[k];

			return f(query(s, t, (k << 1) + 1, l, (l + r) >> 1), query(s, t, (k + 1) << 1, (l + r) >> 1, r));
		}
	}

	class Scanner
	{
		string[] s;
		int i;

		char[] cs = new char[] { ' ' };

		public Scanner()
		{
			s = new string[0];
			i = 0;
		}

		public string Read() => ReadString();

		public string ReadString()
		{
			if (i < s.Length) return s[i++];
			string st = Console.ReadLine();
			while (st == "") st = Console.ReadLine();
			s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
			if (s.Length == 0) return ReadString();
			i = 0;
			return s[i++];
		}

		public string[] ReadStringArray(int N)
		{
			string[] Array = new string[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = ReadString();
			}
			return Array;
		}

		public int ReadInt()
		{
			return int.Parse(ReadString());
		}

		public int[] ReadIntArray(int N, int add = 0)
		{
			int[] Array = new int[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = ReadInt() + add;
			}
			return Array;
		}

		public long ReadLong()
		{
			return long.Parse(ReadString());
		}

		public long[] ReadLongArray(int N, long add = 0)
		{
			long[] Array = new long[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = ReadLong() + add;
			}
			return Array;
		}

		public double ReadDouble()
		{
			return double.Parse(ReadString());
		}

		public double[] ReadDoubleArray(int N, double add = 0)
		{
			double[] Array = new double[N];
			for (int i = 0; i < N; i++)
			{
				Array[i] = ReadDouble() + add;
			}
			return Array;
		}

		public T1 ReadValue<T1>() => (T1)Convert.ChangeType(ReadString(), typeof(T1));
	}
}