#include <iostream>
#include <vector>
#include <functional>
using namespace std;

int main()
{
    int N;
    cin>>N;
    vector<vector<int>> E(N), EI(N);
    for (int i=0; i<N-1; i++)
    {
        int a, b;
        cin>>a>>b;
        E[a-1].push_back(b-1);
        EI[a-1].push_back(i);
        E[b-1].push_back(a-1);
        EI[b-1].push_back(i);
    }

    function<long long(int, int, int, long long)> f = [&](int c, int p, int g, long long m)
    {
        if (c==g)
            return m;

        for (int i=0; i<(int)E[c].size(); i++)
            if (E[c][i]!=p)
            {
                long long r = f(E[c][i], c, g, m|1LL<<EI[c][i]);
                if (r!=-1)
                    return r;
            }
        return -1LL;
    };

    int M;
    cin>>M;
    vector<long long> C(M);
    for (long long &c: C)
    {
        int u, v;
        cin>>u>>v;
        c = f(u-1, -1, v-1, 0);
    }

    vector<long long> T(1<<M);
    T[0] = 1;
    for (int i=0; i<N-1; i++)
    {
        int x = 0;
        for (int j=0; j<M; j++)
            if (C[j]>>i&1)
                x |= 1<<j;

        vector<long long> P = T;
        for (int i=0; i<1<<M; i++)
            T[i|x] += P[i];
    }
    cout<<T[(1<<M)-1]<<endl;
}
