#include <bits/stdc++.h> // #define int long long #define inf 0x3f3f3f3f #define ll long long #define pii pair<int, int> #define db double using namespace std; const int maxn = 10; const int mod = 998244353; string str[10]; int vis[maxn]; string ans; void dfs(int u) { vis[u] = 1; for (in...