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

using namespace std;

int gett(string s){
    int res = 0;
    for(size_t i = 0; i < s.size(); ++i){
        res = res*10+s[i]-'0';
    }
    return res;
}

int main(void) {

    int t; cin >> t;
    while(t--){
        string n, a,b; cin >> n >> a >> b;
        int nn = gett(n), aa = gett(a), bb = gett(b);
        //cout << nn << ' ' << aa << ' ' << bb << '\n';
        if(nn / aa != bb){
            cout <<"NO\n";
            continue;
        }
        if(aa%10==0 && bb%10==0){
            cout << "NO\n";
            continue;
        }
        if(a.size()!=b.size()){
            cout << "NO\n";
            continue;
        }
        multiset<char> no, ab;
        for(size_t i = 0; i < a.size(); ++i){
            ab.insert(a[i]);
            ab.insert(b[i]);
        }
        for(size_t i = 0; i < n.size(); ++i){
            no.insert(n[i]);
        }
        if(no!=ab){
            cout << "NO\n";
            continue;
        }
        cout << "YES\n";

    }
    return 0;

}