#include <iostream>
#include <cmath>

int Input(){
    int a = 0;
    std::cin>>a;
    return a;
}
int main(){
    int counts[10] = {0,0,0,0,0,0,0,0,0,0};
    int caseNum = Input();
    for(int i = 0 ; i < caseNum; i++){
        int n = Input();
        int a = Input();
        int b = Input();
        if(n != a * b) {
            std::cout<<"N0"<<std::endl;
            continue;
        }
        int d_a = a%10;
        int d_b = b%10;
       
        if(d_a == 0 && d_b == 0) {
            std::cout<<"N0"<<std::endl;
            continue;
        }
        bool flag = false;
        int digit_a, digit_b;
        while(1){
            digit_a = a%10;
            digit_b = b%10;
            counts [digit_a]++;
            counts [digit_b]++;
            a /= 10;
            b /= 10;
            if(a == 0 && b != 0) {
                break;
            }
            if(a != 0 && b == 0) {
                break;
            }
                        
            if(a == 0 && b == 0) {
                flag = true;
                break;
            }
        }

        
        if(flag == false) {
            std::cout<<"N0"<<std::endl;
            continue;
        };

        while(1){
            int digit_n = n % 10;
            counts[digit_n] --;
            n = n / 10;
            if(n == 0) break;
        }
        bool flag2 = true;
        for(int i = 0; i < 10; i++){
            if(counts[i] != 0) {
              flag2 = false;  
              break;
            }
        }

        if(!flag2) {
            std::cout<<"N0"<<std::endl;
            continue;
        }
        std::cout<<"YES"<<std::endl;

    }
    return 0;
}