import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int q = sc.nextInt();
		int[] arr = new int[n + 1];
		for (int i = 1; i <= n; i++) {
		    arr[i] = arr[i - 1] ^ sc.nextInt();
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < q; i++) {
		    int left = sc.nextInt();
		    int right = sc.nextInt();
		    sb.append(arr[right] ^ arr[left - 1]).append("\n");
		}
		System.out.print(sb);
	}
}