#include <iostream>
#include <bits/stdc++.h>

using namespace std;

void solve(){
    string n, a, b;
    cin >> n >> a >> b;

    long n_ = stol(n);
    long a_ = stol(a);
    long b_ = stol(b);
    if (a_ * b_ != n_){
        cout << "NO" << endl;
        return;
    }

    const int n2 = (int)(n.length()) / 2;
    if (a.length() != n2 && b.length() != n2){
        cout << "NO" << endl;
        return;
    }

    map<char, int> word;
    for (auto c: n){
        word[c]++;
    }

    if (a[a.length() - 1] == '0' && b[b.length() - 1] == '0'){
        cout << "NO" << endl;
        return;
    }

    for (auto c : a){
        if (word.find(c) == word.end()){
            cout << "NO" << endl;
            return;
        }
        auto cnt = word[c];
        if (cnt == 0) {
            cout << "NO" << endl;
            return;
        }
        word[c]--;
    }

    for (auto c : b){
        if (word.find(c) == word.end()){
            cout << "NO" << endl;
            return;
        }
        auto cnt = word[c];
        if (cnt == 0 ) {
            cout << "NO" << endl;
            return;
        }
        word[c]--;
    }

    cout << "YES" << endl;
}
int main() {
    int t;
    cin >> t;
    while (t--) solve();
    return EXIT_SUCCESS;
}