#define chain_width 9
#define chain_height 9
static unsigned char chain_bits[] = {
   0xe0, 0x00, 0x10, 0x01, 0x10, 0x01, 0x10, 0x01, 0xee, 0x00, 0x11, 0x00,
   0x11, 0x00, 0x11, 0x00, 0x0e, 0x00 };