#include <bits/stdc++.h>

using namespace std;
using ull = unsigned long long;

ull f(ull x) {
    x ^= x << 3;
    x ^= x >> 5;
    x ^= x << 13;
    return x;
}

ull get(int n) {
    vector<vector<int>> e(n);
    for (int i = 0, u, v; i < n - 1; i++) {
        cin >> u >> v;
        u--;
        v--;
        e[u].push_back(v);
        e[v].push_back(u);
    }
    function<ull(int, int)> dfs = [&](int u, int fa) {
        ull res = 114514;
        for (int v: e[u]) {
            if (v == fa) continue;
            res += f(dfs(v, u));
        }
        return res;
    };
    return dfs(0, -1);
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int t;
    cin >> t;
    while (t--) {
        int n;
        cin >> n;
        cout << (get(n) == get(n) ? "Isomorphism" : "No") << "\n";
    }
    return 0;
}