MAX_DS
static char symbol[MAX_DS] = { ' ', 'x', '+', '*', '%', '#', '@', 'O' };
if (k >= 0 && k < MAX_DS)
const char *setfilenames[MAX_DS - 1];
struct dataset *ds[MAX_DS - 1];
FILE *setfiles[MAX_DS - 1];
if (argc > (MAX_DS - 1))