#include <bits/stdc++.h>
#define all(a) a.begin(), a.end()
#define popcount(x) __builtin_popcountll(x)
using namespace std;
using namespace chrono;
vector<int> ucs(vector<int> A, vector<int> B) {
    for (int i = 0; i < A.size(); i++) if (A[i] != B[i]) {
        return {};
    }
    return A;
}
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