#include <bits/stdc++.h>   using namespace std;   const long long mod = 1000000007;   const long double PI = 3.141592653589793;   const long long maxn = 100005;   long long x, y, z, n, k;   void _print(long long t) { cerr << t; }   void _print(string t) { cerr << t; }   void _print(char t) { cerr << t; }   void _print(long double t) { cerr << t; }   void _print(double t) { cerr << t; }   template <class T, class V>   void _print(pair<T, V> p);   template <class T>   void _print(vector<T> v);   template <class T>   void _print(set<T> v);   template <class T, class V>   void _print(map<T, V> v);   template <class T>   void _print(multiset<T> v);   template <class T, class V>   void _print(pair<T, V> p) {     cerr <<  { ;     _print(p.first);     cerr <<  , ;     _print(p.second);     cerr <<  } ;   }   template <class T>   void _print(vector<T> v) {     cerr <<  [  ;     for (T i : v) {       _print(i);       cerr <<    ;     }     cerr <<  ] ;   }   template <class T>   void _print(set<T> v) {     cerr <<  [  ;     for (T i : v) {       _print(i);       cerr <<    ;     }     cerr <<  ] ;   }   template <class T>   void _print(multiset<T> v) {     cerr <<  [  ;     for (T i : v) {       _print(i);       cerr <<    ;     }     cerr <<  ] ;   }   template <class T, class V>   void _print(map<T, V> v) {     cerr <<  [  ;     for (auto i : v) {       _print(i);       cerr <<    ;     }     cerr <<  ] ;   }   void solve() {     string s, t;     cin >> s >> t;     long long f[26];     memset(f, 0, sizeof(f));     long long n = (long long)s.size(), m = (long long)t.size();     vector<vector<long long>> v(26);     for (long long i = 0; i <= n - 1; i++) {       f[s[i] -  a ]++;       v[s[i] -  a ].push_back(i);     }     for (long long i = 0; i <= m - 1; i++) {       if (f[t[i] -  a ] == 0) {         cout << -1 <<   n ;         return;       }     }     long long ans = 1, last = -1;     for (long long i = 0; i <= m - 1; i++) {       long long prev = last;       long long val = t[i] -  a ;       long long pos =           lower_bound(v[val].begin(), v[val].end(), last + 1) - v[val].begin();       if (pos == v[val].size()) {         ans++;         last = v[val][0];       } else {         last = v[val][pos];       }     }     cout << ans <<   n ;   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     cout << setprecision(15) << fixed;     long long t;     t = 1;     cin >> t;     while (t--) {       solve();     }     return 0;   }   