#include <iostream>
#include <algorithm>

using namespace std;

int main(){
  int n;
  cin >> n;
  string r[n];
  string s, t;
  for (int i = 0; i < n; ++i){
    cin >> s >> t;
    sort(s.begin(), s.end());
    sort(t.begin(), t.end());
    if (s == t) r[i] = "yes";
    else r[i] = "no";
  }
  for (int i = 0; i < n; ++i){
    cout << r[i] << endl;
  }
  return 0;
}