#include <stdio.h>

int main (void)
{
  int k, K;
  int n, r, v;
  int i, j;
  char s[100][101];
  char t[103];
  int cr[100];
  int vo[100];
  int rv[10];
  char invalid;

  FILE *in = fopen ("winner.in", "r");
  fscanf (in, "%d\n", &K);
  for (k = 1; k <= K; k ++)
    {
      fscanf (in, "%d %d %d\n", &n, &r, &v);
      for (i = 0; i < n; i ++)
	{
	  fgets (t, 101, in); t[strlen(t)-1] = 0; 
	  cr[i] = t[0] - '0'; strcpy (s[i], t+2);
	  vo[i] = 0;
	}
      for (j = 0; j < v; j ++)
	{
	  fgets (t, 101, in); t[strlen(t)-1] = 0; 
	  for (i = 1; i <= r; i ++) rv[i] = 0;
	  invalid = 0;
	  for (i = 0; i < n; i ++)
	    {
	      if (t[i] == 'x')
		{
		  vo[i] ++;
		  rv[cr[i]] ++;
		  if (rv[cr[i]] > 1) invalid = 1;
		}
	    }
	  if (invalid)
	    {
	    for (i = 0; i < n; i ++)
	      if (t[i] == 'x')  vo[i] --;
	    }
	}
      for (i = 1; i <= r; i ++) rv[i] = 0;
      for (i = 0; i < n; i ++)
	if (vo[i] > rv[cr[i]]) rv[cr[i]] = vo[i];
      printf ("Data Set %d:\n", k);
      for (i = 0; i < n; i ++)
	  if (vo[i] == rv[cr[i]]) printf ("%s\n", s[i]);
    }
  fclose (in);
  return 0;
}