import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.StringTokenizer;

public class Main { public static void main(String[] args) throws IOException { FastScanner fs = new FastScanner(); PrintWriter out = new PrintWriter(System.out);

	int n = fs.nextInt();
	int m = fs.nextInt();
	int[] s = new int[n + 1];
	for(int i = 0;i < n;i++) {
		s[i + 1] = s[i] ^ fs.nextInt();
	}
	while(m-- > 0) {
		int l = fs.nextInt();
		int r = fs.nextInt();
		out.println(s[r] ^ s[l - 1]);
	}
	out.flush();
}

static class FastScanner {
	BufferedReader br;
	StringTokenizer st;

	public FastScanner() {
		br = new BufferedReader(new InputStreamReader(System.in));
	}

	boolean hasNext() throws IOException {
		while (st == null || !st.hasMoreTokens()) {
			String line = br.readLine();
			if (line == null)
				return false;
			st = new StringTokenizer(line);
		}
		return true;
	}

	public String next() throws IOException {
		hasNext();
		return st.nextToken();
	}

	public int nextInt() throws IOException {
		return Integer.parseInt(next());
	}

	public long nextLong() throws IOException {
		return Long.parseLong(next());
	}

	public double nextDouble() throws IOException {
		return Double.parseDouble(next());
	}

	public String readLine() throws IOException {
		return br.readLine();
	}
}

}