#include <bits/stdc++.h>
using namespace std;

using i64 = long long;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    auto solve = [&]() {
        int q;
        cin >> q;

        int lst = 0;
        vector<array<int, 3>> a;

        while (q--) {
            int op, x, y;
            cin >> op >> x >> y;

            x ^= lst, y ^= lst;

            if (op == 1) {
                int w;
                cin >> w;
                w ^= lst;
                a.push_back({w, x, y});
                sort(a.rbegin(), a.rend());
                vector<array<int, 3>> newa;
                for (auto [c, a, b] : a) {
                    bool worse = false;
                    for (auto [c2, a2, b2] : newa) {
                        if (a == a2 && b == b2) {
                            worse = true;
                        }
                    }
                    if (!worse) {
                        newa.push_back({c, a, b});
                    }
                }
                newa.resize(4);
                a = move(newa);
            } else {
                int ans = 0;
                for (auto [c, a, b] : a) {
                    if (x != a && y != b) {
                        ans = max(ans, c);
                    }
                }
                cout << (lst = ans) << '\n';
            }
        }
    };
    
    solve();
    
    return 0;
}