/*

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       _/_/        _/_/_/      _/_/_/        _/_/_/      _/  _/_/               _/_/_/
    _/    _/    _/            _/    _/    _/    _/      _/_/          _/       _/    _/
   _/    _/    _/            _/    _/    _/    _/      _/            _/       _/    _/
    _/_/        _/_/_/      _/    _/      _/_/_/      _/            _/       _/    _/

*/
#include<bits/stdc++.h>
#define int long long

using namespace std;
const int inf=1e18;

struct FenwickTree{
    int sz;
    vector<int>c;
    FenwickTree(int n=0){sz=n,c.assign(sz+1,0ll);}
    void init(int n=0){sz=n,c.assign(sz+1,0ll);}
    int lowbit(int x){return -x&x;}
    void add(int u,int k){
        for(;u;u-=lowbit(u)) c[u]+=k;
    }
    int query(int u){
        int ans=0;
        for(;u<=sz;u+=lowbit(u)) ans+=c[u];
        return ans;
    }
}ft;

struct SegmentTree{
    vector<int>s;
    vector<int>tag;
    SegmentTree(int _n){s.assign(_n+1<<2,0ll),tag.assign(_n+1<<2,0ll);};
    void pushtag(int u,int cl,int cr,int k){
        if(k) s[u]=tag[u]=k;
    }
    void pushdown(int u,int cl,int cr){
        int mid=cl+cr>>1;
        pushtag(u<<1,cl,mid,tag[u]);
        pushtag(u<<1|1,mid+1,cr,tag[u]);
        tag[u]=0;
    }
    void modify(int u,int cl,int cr,int l,int r,int k){
        if(r<cl || cr<l) return;
        if(l<=cl && cr<=r){
            int x=cr-cl+1;
            ft.add(s[u],-x);
            pushtag(u,cl,cr,k);
            ft.add(s[u],x);
            return;
        }
        pushdown(u,cl,cr);
        int mid=cl+cr>>1;
        modify(u<<1,cl,mid,l,r,k);
        modify(u<<1|1,mid+1,cr,l,r,k);
    }
};

void solve(){
    int n,k,m;
    cin>>n>>k>>m;
    vector<vector<int>>e(n+1);
    for(int i=1;i<n;++i){
        int u,v;
        cin>>u>>v;
        e[u].push_back(v);
        e[v].push_back(u);
    }
    vector<int>bfn(n+1),fa(n+1),p(n+1);
    vector l(n+1,vector(k+1,n+1)),r(n+1,vector(k+1,0ll));
    queue<int>q;
    q.push(1);
    int tot=0;
    while(!q.empty()){
        auto u=q.front();q.pop();
        bfn[++tot]=u;
        p[u]=tot;
        for(auto v:e[u]){
            if(v==fa[u]) continue;
            fa[v]=u;
            q.push(v);
        }
    }
    for(int i=1;i<=n;++i)cerr<<p[i]<<" \n"[i==n];
    for(int i=n;i;--i){
        int u=i;
        int pos=p[u];
        for(int j=0;j<=k;++j){
            l[u][j]=min(l[u][j],pos);
            r[u][j]=max(r[u][j],pos);
            u=fa[u];
            if(!u) break;
        }
    }
        // for(int i=1;i<=n;++i){
        //     for(int j=0;j<=k;++j) cerr<<i<<" "<<j<<" : "<<l[i][j]<<" "<<r[i][j]<<endl;
        // }
    vector<vector<pair<int,int>>>Q(n+1);
    for(int i=0;i<m;++i){
        int l,r;
        cin>>l>>r;
        Q[r].push_back({l,i});
    }
    vector<int>res(m);
    ft.init(n);
    SegmentTree seg(n);
    for(int i=1;i<=n;++i){
        vector<int>cl(2*k+1,n+1),cr(2*k+1,0ll);
        int u=i;
        for(int x=0;x<=k;++x){
            for(int y=0;x+y<=k;++y){
                cl[k+x-y]=min(cl[k+x-y],l[u][y]);
                cr[k+x-y]=max(cr[k+x-y],r[u][y]);
            }
            u=fa[u];
            if(!u) break;
        }
        for(int j=0;j<=2*k;++j){
            if(cl[j]>cr[j]) continue;
            // cerr<<i<<" "<<j<<" "<<cl[j]<<" "<<cr[j]<<endl;
            seg.modify(1,1,n,cl[j],cr[j],i);
        }
        for(auto [l,id]:Q[i]) res[id]=ft.query(l);
    }
    for(auto i:res) cout<<i<<"\n";
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;cin>>T;
    while(T--) solve();
}