#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
void input(vector<int>& pre, vector<int>& in)
{
int n;
cin >> n;
for (int i = 0; i < n; i++)
{
int x;
cin >> x;
pre.push_back(x);
}
for (int i = 0; i < n; i++)
{
int x;
cin >> x;
in.push_back(x);
}
}
void solve(vector<int>& pre, vector<int>& in, vector<int>& post, vector<int>::iterator left, vector<int>::iterator right, int i)
{
if (i >= pre.size())
return;
if (left >= right)
return;
if (left == right - 1)
{
post.push_back(*left);
return;
}
auto pos = find(left, right, pre[i]);
solve(pre, in, post, left, pos, i + 1);
solve(pre, in, post, pos + 1, right, distance(in.begin(), pos) + 1);
if (find(post.begin(), post.end(), pre[i]) == post.end())
post.push_back(pre[i]);
}
void output(vector<int>& post)
{
for (auto i = post.begin(); i != post.end(); i++)
cout << *i << " ";
cout << "\n";
}
int main()
{
ios_base::sync_with_stdio(0);
int z;
cin >> z;
while (z--)
{
vector<int> preorder;
vector<int> inorder;
vector<int> postorder;
input(preorder, inorder);
solve(preorder, inorder, postorder, inorder.begin(), inorder.end(),0);
output(postorder);
}
return 0;
}
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