#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
#define all(v) v.begin(), v.end()
#define pb push_back    
#define sz(x) (int)(x).size()
const int N = 3e5 + 5;
void solve() {
    int n;
    string a, b;
    cin >> n >> a >> b;
    vector<vi> ga(15), gb(15);
    vector<char> aa, bb; 
    for(int i = 0; i < n; ++i){
        if(isdigit(a[i]))
            ga[a[i] - '0'].pb(i), aa.pb(a[i]);
        if(isdigit(b[i]))
            gb[b[i] - '0'].pb(i), bb.pb(b[i]);
    }
    if(aa == bb){
        bool ok = 1;
        for(int nn = 0; nn <= 9; ++nn){
            for(int i = 0; i < sz(gb[nn]); ++i){
                if(nn & 1)
                    ok &= (gb[nn][i] <= ga[nn][i]);
                else
                    ok &= (gb[nn][i] >= ga[nn][i]);
            }
        }
        if(ok)
            cout << "yes";
        else
            // puts("no");
            cout << "no";
    }else {
        // puts("no");
        cout << "no";
    }
}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
    cin >> t;
    // scanf("%d",&t);
    while(t--)
        solve(), cout << '\n';
}