#include <stdio.h>

#define assert(cond) \
  if (!(cond)) {printf("False.\n"); stop(); }

#define ss step();
#define nx next();

#define ls system("ls");
#define ll(file) system("ls -las " #file); /* don't quote file */

#define pd(var) printf("var: %d\n",var);
#define pf(var) printf("var: %f\n",var);
#define ps(var) printf("var: %s\n",var);

