/* Aa^~ kokoro ga pyonpyon suru n jaa^~
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// MMMMM#<<_jwr:(Z4QHHMMHMHHHHHHHHHHHHHHHHHHHHHHHHHHHH###NHSXZ>` ~````.OXtt>~._<?MM
*/
#include<bits/stdc++.h>
using namespace std;
#ifndef ONLINE_JUDGE
#define dbg(x...) do { cout << "\033[32;1m " << #x << " -> "; err(x); } while (0)
void err() { cout << "\033[39;0m" << endl; }
template<template<typename...> class T, typename t, typename... A>
void err(T<t> a, A... x) { for (auto v: a) cout << v << ' '; err(x...); }
template<typename T, typename... A>
void err(T a, A... x) { cout << a << ' '; err(x...); }
#else
#define dbg(...)
#endif
typedef long long ll;
typedef pair<int,int> pi;
typedef vector<int> vi;
template<class T> using vc=vector<T>;
template<class T> using vvc=vc<vc<T>>;
template<class T> void mkuni(vector<T>&v)
{
    sort(v.begin(),v.end());
    v.erase(unique(v.begin(),v.end()),v.end());
}
ll rand_int(ll l, ll r) //[l, r]
{
    static mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());
    return uniform_int_distribution<ll>(l, r)(gen);
}
template<class T>
void print(T x,int suc=1)
{
    cout<<x;
    if(suc==1) cout<<'\n';
    else cout<<' ';
}
template<class T>
void print(const vector<T>&v,int suc=1)
{
    for(int i=0;i<v.size();i++)
    print(v[i],i==(int)(v.size())-1?suc:2);
}
const int maxn=55;
struct Edge{
    int to,w;
};
vc<Edge> G[maxn];
ll st[maxn];
void dfs(int u,int tar,ll ss,int ori,int fa=-1)
{
    if(u==tar)
    {
        st[ori]=ss;
        return ;
    }
    for(auto &e:G[u])if(e.to!=fa)
    {
        int v=e.to;
        dfs(v,tar,ss|(1LL<<e.w),ori,u);
    }
}

int main()
{
    int n;
    cin>>n;
    for(int i=1,u,v;i<n;i++)
    {
        cin>>u>>v;
        u--;v--;
        G[u].push_back(Edge{v,i-1});
        G[v].push_back(Edge{u,i-1});
    }
    int m;
    cin>>m;
    for(int i=0;i<m;i++)
    {
        int u,v;
        cin>>u>>v;
        u--;v--;
        dfs(u,v,0,i);
        //dbg(i,st[i]);
    }
    ll ans=0;
    for(int S=0;S<(1<<m);S++)
    {
        ll T=0;
        for(int j=0;j<m;j++)
        {
            if(S>>j&1) T|=st[j];
        }
        int cc=__builtin_popcountll(T);
        //dbg(S,T,cc);
        int rem=n-1-cc;
        cc=__builtin_popcountll(S);
        if(cc&1) ans-=(1LL<<rem);
        else ans+=(1LL<<rem);
    }
    print(ans);
}

Measured memory_bytes: 256