description: A subarray of array a from index l to the index r is the array [a_l, a_{l+1}, ..., a_{r}]. The number of occurrences of the array b in the array a is the number of subarrays of a such that they are equal to b.
  
  You are given n arrays A_1, A_2, ..., A_n; the elements of these arrays are integers from 1 to k. You have to build an array a consisting of m integers from 1 to k in such a way that, for every given subarray A_i, the number of occurrences of A_i in the array a is not less than the number of occurrences of each non-empty subarray of A_i in a. Note that if A_i doesn't occur in a, and no subarray of A_i occurs in a, this condition is still met for A_i.
  
  Your task is to calculate the number of different arrays a you can build, and print it modulo 998244353.
  
  Input
  
  The first line contains three integers n, m and k (1 ≤ n, m, k ≤ 3 ⋅ 10^5) — the number of the given arrays, the desired length of the array a, and the upper bound on the values in the arrays.
  
  Then n lines follow. The i-th line represents the array A_i. The first integer in the i-th line is c_i (1 ≤ c_i ≤ m) — the number of elements in A_i; then, c_i integers from 1 to k follow — the elements of the array A_i.
  
  Additional constraint on the input: ∑_{i=1}^n c_i ≤ 3 ⋅ 10^5; i. e., the number of elements in the given arrays in total does not exceed 3 ⋅ 10^5.
  
  Output
  
  Print one integer — the number of different arrays a you can build, taken modulo 998244353.
  
  Examples
  
  Input
  
  
  2 4 3
  2 1 2
  1 3
  
  
  Output
  
  
  5
  
  
  Input
  
  
  2 4 3
  2 1 2
  3 3 2 1
  
  
  Output
  
  
  0
  
  
  Input
  
  
  1 42 1337
  2 13 31
  
  
  Output
  
  
  721234447
solution: #include <bits/stdc++.h>
  using namespace std;
  long long gcd(long long a, long long b) {
    if (!a || !b) return a | b;
    unsigned shift = __builtin_ctz(a | b);
    a >>= __builtin_ctz(a);
    do {
      b >>= __builtin_ctz(b);
      if (a > b) swap(a, b);
      b -= a;
    } while (b);
    return a << shift;
  }
  long long lcm(long long a, long long b) { return (long long)a * b / gcd(a, b); }
  const int INF = 800000010;
  int lsb(int i) { return i & -i; }
  struct SegTree {
    int size;
    vector<long long> arr;
    void init(int sz) {
      size = 1;
      while (size < sz) size *= 2;
      arr.resize(2 * size - 1);
      for (int i = (0); (1) > 0 ? i < (size) : i > (size); i += (1)) {
        arr[i] = 0;
      }
    }
    void set(int i, long long val, int x, int lx, int rx) {
      int mid = (lx + rx) / 2;
      if (lx == rx) {
        arr[x] += val;
      } else {
        if (i <= mid) {
          set(i, val, 2 * x + 1, lx, mid);
        } else {
          set(i, val, 2 * x + 2, mid + 1, rx);
        }
        arr[x] = arr[2 * x + 1] + arr[2 * x + 2];
      }
    }
    void set(int i, long long val) { set(i, val, 0, 0, size - 1); }
    long long get(int x, int y) { return get(x, y, 0, 0, size - 1); }
    long long get(int l, int r, int x, int lx, int rx) {
      int mid = (lx + rx) / 2;
      if (l == lx && r == rx) {
        return arr[x];
      } else if (l <= mid && r >= mid + 1) {
        return get(l, mid, 2 * x + 1, lx, mid) +
               get(mid + 1, r, 2 * x + 2, mid + 1, rx);
      } else if (l <= mid) {
        return get(l, r, 2 * x + 1, lx, mid);
      } else {
        return get(l, r, 2 * x + 2, mid + 1, rx);
      }
    }
    int getval(int i) { return (arr[i]); }
    int getsize() { return size; }
  };
  template <class T>
  bool umin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0;
  }
  template <class T>
  bool umax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0;
  }
  int binarySearch(vector<int> arr, int p, int r, int num) {
    if (p <= r) {
      int mid = (p + r) / 2;
      if (arr[mid] == num) return mid;
      if (arr[mid] > num) return binarySearch(arr, p, mid - 1, num);
      if (arr[mid] > num) return binarySearch(arr, mid + 1, r, num);
    }
    return -1;
  }
  long long FIRSTTRUE(function<bool(long long)> f, long long lb, long long rb) {
    while (lb < rb) {
      long long mb = (lb + rb) / 2;
      f(mb) ? rb = mb : lb = mb + 1;
    }
    return lb;
  }
  long long LASTTRUE(function<bool(long long)> f, long long lb, long long rb) {
    while (lb < rb) {
      long long mb = (lb + rb + 1) / 2;
      f(mb) ? lb = mb : rb = mb - 1;
    }
    return lb;
  }
  template <class A>
  void read(vector<A>& v);
  template <class A, size_t S>
  void read(array<A, S>& a);
  template <class T>
  void read(T& x) {
    cin >> x;
  }
  void read(double& d) {
    string t;
    read(t);
    d = stod(t);
  }
  void read(long double& d) {
    string t;
    read(t);
    d = stold(t);
  }
  template <class H, class... T>
  void read(H& h, T&... t) {
    read(h);
    read(t...);
  }
  template <class A>
  void read(vector<A>& x) {
    for (auto& a : x) read(a);
  }
  template <class A, size_t S>
  void read(array<A, S>& x) {
    for (auto& a : x) read(a);
  }
  string to_string(char c) { return string(1, c); }
  string to_string(bool b) { return b ? "true" : "false"; }
  string to_string(const char* s) { return string(s); }
  string to_string(string s) { return s; }
  string to_string(vector<bool> v) {
    string res;
    for (int i = (0); (1) > 0 ? i < ((int)(v).size()) : i > ((int)(v).size());
         i += (1))
      res += char('0' + v[i]);
    return res;
  }
  template <size_t S>
  string to_string(bitset<S> b) {
    string res;
    for (int i = (0); (1) > 0 ? i < (S) : i > (S); i += (1))
      res += char('0' + b[i]);
    return res;
  }
  template <class T>
  string to_string(T v) {
    bool f = 1;
    string res;
    for (auto& x : v) {
      if (!f) res += ' ';
      f = 0;
      res += to_string(x);
    }
    return res;
  }
  template <class A>
  void write(A x) {
    cout << to_string(x);
  }
  template <class H, class... T>
  void write(const H& h, const T&... t) {
    write(h);
    write(t...);
  }
  void print() { write("\n"); }
  template <class H, class... T>
  void print(const H& h, const T&... t) {
    write(h);
    if (sizeof...(t)) write(' ');
    print(t...);
  }
  void DBG() { cerr << "]" << endl; }
  template <class H, class... T>
  void DBG(H h, T... t) {
    cerr << to_string(h);
    if (sizeof...(t)) cerr << ", ";
    DBG(t...);
  }
  template <class T>
  void offset(long long o, T& x) {
    x += o;
  }
  template <class T>
  void offset(long long o, vector<T>& x) {
    for (auto& a : x) offset(o, a);
  }
  template <class T, size_t S>
  void offset(long long o, array<T, S>& x) {
    for (auto& a : x) offset(o, a);
  }
  mt19937 mt_rng(chrono::steady_clock::now().time_since_epoch().count());
  long long randint(long long a, long long b) {
    return uniform_int_distribution<long long>(a, b)(mt_rng);
  }
  template <class T, class U>
  void vti(vector<T>& v, U x, size_t n) {
    v = vector<T>(n, x);
  }
  template <class T, class U>
  void vti(vector<T>& v, U x, size_t n, size_t m...) {
    v = vector<T>(n);
    for (auto& a : v) vti(a, x, m);
  }
  const int d4i[4] = {-1, 0, 1, 0}, d4j[4] = {0, 1, 0, -1};
  const int d8i[8] = {-1, -1, 0, 1, 1, 1, 0, -1},
            d8j[8] = {0, 1, 1, 1, 0, -1, -1, -1};
  const int mxN = 5e5 + 1, M = 1e9 + 7;
  int n, m, p[mxN];
  int find(int x) { return x ^ p[x] ? p[x] = find(p[x]) : x; }
  bool join(int x, int y) {
    if ((x = find(x)) == (y = find(y))) return 0;
    p[find(x)] = find(y);
    return 1;
  }
  long long pow(long long a, long long b, long long mod) {
    if (b == 0) {
      return 1;
    }
    long long sum = pow(a, b / 2, mod);
    if (b % 2 == 1) {
      return (((sum * sum) % mod) * a) % mod;
    } else {
      return (sum * sum) % mod;
    }
  }
  set<int> adjlist[300005];
  set<int> ingree[300005];
  bool visited[300005];
  long long dp[300005];
  map<int, int> mp;
  int cur = 0;
  void dfs(int node) {
    if (visited[node]) return;
    visited[node] = true;
    cur++;
    if (adjlist[node].size() > 1 || ingree[node].size() > 1) return;
    if (adjlist[node].empty()) {
      if (mp.find(cur) == mp.end()) {
        mp[cur] = 1;
      } else {
        mp[cur]++;
      }
      return;
    }
    for (auto& e : adjlist[node]) dfs(e);
  }
  void solve() {
    int n, m, k;
    cin >> n >> m >> k;
    for (int i = (0); (1) > 0 ? i < (n) : i > (n); i += (1)) {
      int c;
      cin >> c;
      int last;
      for (int j = (0); (1) > 0 ? j < (c) : j > (c); j += (1)) {
        if (j == 0) {
          cin >> last;
          last--;
        } else {
          int u;
          cin >> u;
          u--;
          adjlist[last].insert(u);
          ingree[u].insert(last);
          last = u;
        }
      }
    }
    for (int i = (0); (1) > 0 ? i < (k) : i > (k); i += (1)) {
      if (ingree[i].empty()) {
        cur = 0;
        dfs(i);
      }
    }
    dp[0] = 1;
    for (int i = 1; i <= m; i++) {
      dp[i] = 0;
      for (auto& e : mp) {
        if (i >= e.first) {
          dp[i] += (long long)e.second * dp[i - e.first];
        }
      }
      dp[i] %= 998244353;
    }
    cout << dp[m] << '\n';
  }
  int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int tc = 1;
    for (int i = (0); (1) > 0 ? i < (tc) : i > (tc); i += (1)) {
      solve();
    }
    return 0;
  }
  