#if BPI == 16
#define ODD_MASK 0xaaaa
#define EVEN_MASK 0x5555
#else
#define ODD_MASK 0xaaaaaaaa
#define EVEN_MASK 0x55555555
#endif

#define POSITIVE 1
#define NEGATIVE 0

#define PRESENT 1
#define ABSENT 0

#define RAISED 2

typedef struct {
	int variable;
	int free_count;
	} VAR;

/* black_white.c */ extern void setup_bw (pset_family R, pset c);
/* black_white.c */ extern void free_bw (void);
/* black_white.c */ extern int black_white (void);
/* black_white.c */ extern void split_list (pset_family R, int v);
/* black_white.c */ extern void merge_list (void);
/* black_white.c */ extern void print_bw (int size);
/* black_white.c */ extern void variable_list_alloc (int size);
/* black_white.c */ extern void variable_list_init (int reduced_c_free_count, int *reduced_c_free_list);
/* black_white.c */ extern void variable_list_delete (int element);
/* black_white.c */ extern void variable_list_insert (int element);
/* black_white.c */ extern int variable_list_empty (void);
/* black_white.c */ extern void get_next_variable (int *pv, int *pphase, pset_family R);
/* black_white.c */ extern void print_variable_list (void);
/* black_white.c */ extern void reset_black_list (void);
/* black_white.c */ extern void push_black_list (void);
/* black_white.c */ extern void pop_black_list (void);
/* canonical.c */ extern pset_family find_canonical_cover (pset_family F1, pset_family D, pset_family R);
/* essentiality.c */ extern pset_family etr_order (pset_family F, pset_family E, pset_family R, pset c, pset d);
/* essentiality.c */ extern void aux_etr_order (pset_family F, pset_family E, pset_family R, pset c, pset d);
/* essentiality.c */ extern pset_family get_mins (pset c);
/* essentiality.c */ extern int ascending (VAR *p1, VAR *p2);
/* util_signature.c */ extern void set_time_limit (int seconds);
/* util_signature.c */ extern void print_cover (pset_family F, char *name);
/* util_signature.c */ extern int sf_equal (pset_family F1, pset_family F2);
/* util_signature.c */ extern int mem_usage (char *name);
/* util_signature.c */ extern int time_usage (char *name);
/* util_signature.c */ extern void s_totals (long time, int i);
/* util_signature.c */ extern void s_runtime (long total);
/* sigma.c */ extern pset get_sigma (pset_family R, register pset c);
/* sigma.c */ extern void set_not (pset c);
/* signature.c */ extern void cleanup (void);
/* signature.c */ extern pset_family signature (pset_family F1, pset_family D1, pset_family R1);
/* signature.c */ extern pset_family generate_primes (pset_family F, pset_family R);
/* signature_exact.c */ extern pset_family signature_minimize_exact (pset_family ESCubes, pset_family ESSet);
/* signature_exact.c */ extern sm_matrix * signature_form_table (pset_family ESCubes, pset_family ESSet);