#define _CRT_SECURE_NO_WARNINGS
#define debug(l) cerr<<#l<<' '<<l<<'\n';
#include "bits/stdc++.h"
using namespace std;
#define all(a) a.begin(), a.end()
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
vector<vector<ll>> gr;
vector<vector<ll>> siz;
vector<ll> clr;
ll ans = 0;
void dfs(ll v, ll p) {
    siz[clr[v]][v] = 1;
    for (ll& u : gr[v]) {
        if (u != p) {
            dfs(u, v);
            siz[0][v] += siz[0][u];
            siz[1][v] += siz[1][u];
        }
    }
    if (siz[1][v] == siz[0][v])ans++;
}
signed main() {
#ifdef _DEBUG
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll t;
    cin >> t;
    while (t--) {
        ans = 0;
        ll n;
        cin >> n;
        gr.clear();
        siz.clear();
        gr.resize(n);
        siz.resize(2, vector<ll>(n, 0));
        clr.resize(n);
        for (ll i = 0; i < n - 1; i++) {
            ll x;
            cin >> x;
            x--;
            gr[x].push_back(i + 1);
            gr[i + 1].push_back(x);
        }
        string s;
        cin >> s;
        for (ll i = 0; i < s.size(); i++) {
            if (s[i] == 'B') {
                clr[i] = 1;
            }
            else {
                clr[i] = 0;
            }
        }
        dfs(0,-1);
        cout << ans << '\n';
    }

}