/* USERNAME: __________________________________________________________ */

#include <stdio.h>
#include <fcntl.h>

main()
{
  int pa[2];
  int pb[2];
  int fd;
  int dummy;






  if (fork() == 0) {






















    execlp("sort", "sort", NULL);






  } 







  if (fork() == 0) {














    execlp("head", "head", "-5", NULL);






  }








  if (fork() == 0) {











    execlp("cat", "cat", "-n", NULL);




  }










}