#include <bits/stdc++.h>
using namespace std;
using idata = vector<int>;
using iset = set<int>;
using igrid = vector<idata>;
using t_road = pair<int, int>;
using t_roads = vector<t_road>;
using t_graph = vector<t_roads>;
using di = pair<int, int>;
using vd = vector<di>;
const int MAXK = 20;
struct Tree {
igrid roads;
idata preordre, postordre, parents, depth;
igrid eulertour;
igrid parents_2k;
void dfs (int node, int parent, int _depth, int &iOrdre) {
preordre[node] = iOrdre ++;
parents [node] = parent;
depth [node] = _depth;
for (int next : roads[node]) if (next != parent) {
eulertour[node].push_back(iOrdre ++);
dfs(next, node, _depth + 1, iOrdre);
}
postordre[node] = iOrdre ++;
}
Tree (int N, igrid &roads) : roads(roads) {
eulertour.resize(N);
postordre.resize(N);
preordre .resize(N);
parents .resize(N);
depth .resize(N);
int iOrdre = 0;
dfs (0, -1, 0, iOrdre);
parents_2k.resize(N, idata(MAXK, -1));
for (int i = 0; i < N; i ++) parents_2k[i][0] = parents[i];
for (int k = 0; k + 1 < MAXK; k ++) {
for (int i = 0; i < N; i ++) {
if (parents_2k[i][k] == -1) continue ;
parents_2k[i][k + 1] = parents_2k[parents_2k[i][k]][k];
}
}
}
int jump (int node, int k) {
for (int i = 0; i < MAXK; i ++)
if ((1 << i) & k)
node = parents_2k[node][i];
return node;
}
int lca (int a, int b) {
if (depth[a] > depth[b]) swap(a, b);
b = jump(b, depth[b] - depth[a]);
if (a == b) return a;
for (int i = MAXK - 1; i >= 0; i --) {
if (parents_2k[a][i] == parents_2k[b][i]) continue ;
a = parents_2k[a][i];
b = parents_2k[b][i];
}
if (a == b) return a;
return parents[a];
}
};
struct VirtualTree {
int size = 1;
t_graph roads;
map<int, int> id_to_vid;
int get (int node) {
return (*id_to_vid.find(node)).second;
}
idata L;
idata R;
idata C;
pair<int, int> dfs (int node, int parent, int coming) {
C[node] = coming;
for (const auto road : roads[node]) if (road.first != parent) {
const auto data = dfs(road.first, node, road.second);
L[node] = max(L[node], data.first);
R[node] = min(R[node], data.second);
}
return { L[node], R[node] };
}
VirtualTree (Tree &tree, iset virtual_set) {
vd order_positions;
for (int u : virtual_set) order_positions.push_back({ tree.preordre[u], u });
sort(order_positions.begin(), order_positions.end());
for (int i = 0; i + 1 < order_positions.size(); i ++){
int u = order_positions[i ].second;
int v = order_positions[i + 1].second;
int l = tree.lca(u, v);
virtual_set.insert(l);
}
vd dist_computations;
for (int u : virtual_set) {
dist_computations.push_back({ tree.preordre [u], u });
for (int h : tree.eulertour[u])
dist_computations.push_back({ h, u });
dist_computations.push_back({ tree.postordre[u], u });
}
sort(dist_computations.begin(), dist_computations.end());
set<pair<int, int>> pot_roads;
for (int i = 0; i + 1 < dist_computations.size(); i ++) {
int u = dist_computations[i] .second;
int v = dist_computations[i + 1].second;
if (u == v) continue ;
pot_roads.insert({ min(u, v), max(u, v) });
}
int iNode = 0;
for (int u : virtual_set)
id_to_vid.insert({ u, iNode ++ });
roads.resize(virtual_set.size());
for (const auto &road : pot_roads) {
int u = road.first; int v = road.second;
int dist = abs(tree.depth[u] - tree.depth[v]);
size += dist;
u = get(u); v = get(v);
roads[u].push_back({ v, dist });
roads[v].push_back({ u, dist });
}
L.resize(virtual_set.size(), - 1e9);
R.resize(virtual_set.size(), 1e9);
C.resize(virtual_set.size());
}
};
struct Query {
int l, r;
int answer;
int order (int mid) {
if (r < mid) return -1;
if (l > mid) return 1;
return 0;
}
};
VirtualTree create (Tree &tree, idata &R, int left, int right, int mid) {
iset values;
for (int u = left; u <= right; u ++)
values.insert(R[u]);
VirtualTree vt (tree, values);
for (int u = left; u <= mid; u ++)
vt.L[vt.get(R[u])] = u;
for (int u = right; u >= mid; u --)
vt.R[vt.get(R[u])] = u;
vt.dfs(vt.get(R[mid]), -1, 1);
return vt;
}
void solve (Tree &tree, idata &R, int l, int r, vector<Query*> queries) { // [l; r]
if (queries.size() == 0) return ;
int mid = (l + r) >> 1;
VirtualTree vt = create(tree, R, l, r, mid);
vector<Query*> left_q, right_q;
for (Query* q : queries) {
int o = q->order(mid);
if (o == -1) left_q.push_back(q);
if (o == 1) right_q.push_back(q);
if (o == 0) {
int res = 0;
for (int i = 0; i < vt.L.size(); i ++)
if (q->l <= vt.L[i] || q->r >= vt.R[i])
res += vt.C[i];
q->answer = res;
}
}
solve(tree, R, l, mid - 1, left_q);
solve(tree, R, mid + 1, r, right_q);
}
int main () {
int N, M, Q;
cin >> N >> M >> Q;
igrid roads(N);
for (int i = 1; i < N; i ++) {
int a, b;
cin >> a >> b;
a --; b --;
roads[a].push_back(b);
roads[b].push_back(a);
}
Tree tree(N, roads);
idata R(M);
for (int i = 0; i < M; i ++) {
cin >> R[i];
R[i] --;
}
vector<Query*> queries;
for (int q = 0; q < Q; q ++) {
int l, r;
cin >> l >> r;
l --; r --;
Query* qu = new Query();
qu->l = l; qu->r = r;
queries.push_back(qu);
}
solve(tree, R, 0, M - 1, queries);
for (Query* q : queries) {
cout << q->answer << "\n";
delete q;
}
}
