#define BLANKBIT	0x20
#define LETBITS		0x1F
#define BLANK		27
#define TILE(t)		(((t) & BLANKBIT) ? BLANK : (t))
#define blank(x)	((x) & BLANKBIT)
#define isblank(x)	((x) == BLANK || blank (x))
#define letr(x)		((x) & LETBITS)

extern char value[];