#define undo_width 32
#define undo_height 9
static char undo_bits[] = {
   0x00, 0x00, 0x00, 0x00, 0x66, 0x66, 0x1e, 0x3c, 0x66, 0x66, 0x36, 0x66,
   0x66, 0x6e, 0x66, 0x66, 0x66, 0x6e, 0x66, 0x66, 0x66, 0x76, 0x66, 0x66,
   0x66, 0x76, 0x66, 0x66, 0x66, 0x66, 0x36, 0x66, 0x3c, 0x66, 0x1e, 0x3c};