#define clear_width 13
#define clear_height 13
static char clear_bits[] = {
   0x00, 0x00, 0x02, 0x04, 0x06, 0x06, 0x0c, 0x03, 0x98, 0x01, 0xf0, 0x00,
   0x60, 0x00, 0xf0, 0x00, 0x98, 0x01, 0x0c, 0x03, 0x06, 0x06, 0x02, 0x04,
   0x00, 0x00};