#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define MAX_SLOVO 5000

int c, k, d;
unsigned char slovo[MAX_SLOVO];

struct uzel
{
  int pocet;
  struct uzel *potomci[255];
  unsigned char znak;
};

struct uzel * trie_uzel(char znak)
{
  struct uzel *u = malloc(sizeof(struct uzel));
  u->znak = znak;
  u->pocet = 0;

  for (unsigned char i='a'; i<='z'; i++)
  {
    u->potomci[i] = NULL;
  }

  return u;
}

void trie_pridej(struct uzel *akt, unsigned char *slovo)
{
  int i = 0;
  do
  {
    if (!akt->potomci[slovo[i]])
      akt->potomci[slovo[i]] = trie_uzel(slovo[i]);

    akt = akt->potomci[slovo[i]];

  } while (slovo[++i]);

  akt->pocet++;
}

void trie_smaz(struct uzel *koren)
{
  for (unsigned char i='a'; i<='z'; i++)
  {
    if (koren->potomci[i])
      trie_smaz(koren->potomci[i]);
  }

  free(koren);
}

void trie_spoj_(struct uzel *cil, struct uzel *akt, unsigned char *buffer, int hloubka)
{
  buffer[hloubka] = akt->znak;

  if (akt->pocet)
  {
    buffer[hloubka+1] = 0;
    trie_pridej(cil, buffer);
  }

  for (unsigned char i='a'; i<='z'; i++)
  {
    if (akt->potomci[i])
      trie_spoj_(cil, akt->potomci[i], buffer, hloubka+1);
  }
}

void trie_spoj(struct uzel *koren1, struct uzel *koren2)
{
  unsigned char buffer[MAX_SLOVO];

  for (unsigned char i='a'; i<='z'; i++)
  {
    if (koren2->potomci[i])
      trie_spoj_(koren1, koren2->potomci[i], buffer, 0);
  }
}

int trie_spocitej_(struct uzel *akt, int hloubka, int hlasu)
{
  if (hlasu + akt->pocet >= k)
    return pow(26, d-hloubka);

  int pocet = 0;
  for (unsigned char i='a'; i<='z'; i++)
  {
    if (akt->potomci[i])
      pocet += trie_spocitej_(akt->potomci[i], hloubka+1, hlasu+akt->pocet);
  }
  return pocet;
}

int trie_spocitej(struct uzel *koren)
{
  return trie_spocitej_(koren, 0, 0);
}

int main(void)
{
  scanf("%d%d%d", &c, &k, &d);

  struct uzel *trie_komise = trie_uzel(0);

  for (int i=0; i<c; i++)
  {
    int L;
    scanf("%d", &L);

    struct uzel *trie_clen = trie_uzel(0);

    for (int j=0; j<L; j++)
    {
      scanf("%s", slovo);
      trie_pridej(trie_clen, slovo);
    }

    trie_spoj(trie_komise, trie_clen);
    trie_smaz(trie_clen);
  }

  int navrhu = trie_spocitej(trie_komise);
  printf("Komise schválí %d návrhů.\n", navrhu);

  trie_smaz(trie_komise);
}