import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws NumberFormatException, IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int cases = Integer.parseInt(br.readLine());

        while(cases-- > 0){
            StringTokenizer st = new StringTokenizer(br.readLine());
            String value = st.nextToken();
            char[] valueArray = new char[value.length()];
            char[] passArray = new char[value.length()];
            String password = st.nextToken();

            valueArray = value.toCharArray();
            passArray = password.toCharArray();

            if(value.equals(password) || value.length() != password.length()){
                System.out.println("No");
            } else{
                Arrays.sort(valueArray);
                Arrays.sort(passArray);

                if(sameArray(valueArray, passArray)){
                    System.out.println("Yes");
                } else {
                    System.out.println("No");
                }
            }
        }
    }
    static boolean sameArray(char[] a, char[] b){
        for(int i=0;i<a.length;i++){
            if(a[i] == b[i]){
            }else{
                return false;
            }
        }
        return true;
    }
}