import java.util.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int q = sc.nextInt();
        int[] xors = new int[n + 1];
        for (int i = 1; i <= n; i++) {
            xors[i] = xors[i - 1] ^ sc.nextInt();
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < q; i++) {
            sb.append(xors[sc.nextInt() - 1] ^ xors[sc.nextInt()]).append("\n");
        }
        System.out.print(sb);
    }
}