#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int q;
    cin >> q;
    int m = 26;
    while (q--) {
        string s, t;
        cin >> s >> t;
        int n = s.size();
        vector<int> c1(m, 0);
        vector<int> c2(m, 0);
        vector<int> c3(m, 0);
        vector<int> c4(m, 0);
        rep(i, n) {
            if (i % 2) {
                c1[s[i] - 'a']++;
                c3[s[i] - 'a']++;
                c1[t[i] - 'a']--;
            } else {
                c2[s[i] - 'a']++;
                c4[s[i] - 'a']++;
                c2[t[i] - 'a']--;
            }
        }
        bool ok = true;
        rep(i, m) {
            if (c1[i] != 0)
                ok = false;
            if (c2[i] != 0)
                ok = false;
        }
        if (!ok) {
            cout << "No" << endl;
            continue;
        }
        ok = false;
        rep(i, m) {
            if (c3[i] >= 2)
                ok = true;
            if (c4[i] >= 2)
                ok = true;
        }
        if (ok) {
            cout << "Yes" << endl;
            continue;
        }
        auto f = [&](vector<int> v) {
            int s = v.size();
            int ans = 0;
            rep(i, s) rep(j, s) {
                if (i >= j)
                    continue;
                if (v[i] > v[j])
                    ans++;
            }
            return ans;
        };
        vector<int> sv1;
        vector<int> tv1;
        vector<int> sv2;
        vector<int> tv2;
        rep(i, n) {
            if (i % 2) {
                sv1.push_back(s[i] - 'a');
                tv1.push_back(t[i] - 'a');
            } else {
                sv2.push_back(s[i] - 'a');
                tv2.push_back(t[i] - 'a');
            }
        }
        int x = f(sv1) + f(sv2) + f(tv1) + f(tv2);
        cout << (x % 2 == 0 ? "Yes" : "No") << endl;
    }
    return 0;
}