#include<iostream>
#include<algorithm>

using namespace std;

int n, op, x, y, w, cnt, ans;

struct V{
  int x, y, w;
} a[10], z;

bool check(V x, V y, V z){
  return (x.x == y.x && y.x == z.x) || (x.x == y.y && y.y == z.y);
}

bool cmp(V x, V y){
  return x.w > y.w;
}

int Ask(int x, int y){
  for(int i = 1; i <= cnt; i++){
    if(a[i].x != x && a[i].y != y) return a[i].w;
  }
  return 0;
}

void Upd(){
  sort(a + 1, a + cnt + 1, cmp);
  for(int i = 2; i <= cnt; i++){
    for(int j = 1; j < i; j++) if(a[i].x == a[j].x && a[i].y == a[j].y) a[i] = z;
    if(i >= 3 && check(a[1], a[2], a[i])) a[i] = z;
    if(i >= 4 && (check(a[2], a[3], a[i]) || check(a[1], a[3], a[i]))) a[i] = z;
  }
  sort(a + 1, a + cnt + 1, cmp);
  if(cnt > 4) cnt = 4;
}

int main(){
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
  cin >> n;
  for(int i = 1; i <= n; i++){
    cin >> op >> x >> y;
    x ^= ans, y ^= ans;
    if(op == 1){
      cin >> w;
      w ^= ans;
      a[++cnt].x = x, a[cnt].y = y, a[cnt].w = w;
      Upd();
    } else {
      ans = Ask(x, y);
      cout << ans << "\n";
    }
  }
  return 0;
}