#define sum_width 16
#define sum_height 16
#define sum_x_hot 9
#define sum_y_hot 8
static char sum_bits[] = {
   0xf0, 0x0f, 0x10, 0x08, 0x20, 0x00, 0x40, 0x00, 0x80, 0x00, 0x00, 0x01,
   0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x02, 0x00, 0x01, 0x80, 0x00,
   0x40, 0x00, 0x20, 0x00, 0x10, 0x08, 0xf0, 0x0f};