#define chains_width 16
#define chains_height 16
static char chains_bits[] = {
   0x9f, 0xf9, 0x9f, 0xf9, 0x3f, 0xff, 0x3f, 0xfe, 0x7f, 0xfc, 0xdc, 0x18,
   0x8c, 0x0d, 0xc7, 0xc7, 0xe3, 0xe3, 0xb0, 0x31, 0x18, 0x3b, 0x3f, 0xfe,
   0x7f, 0xfc, 0xff, 0xfc, 0x9f, 0xf9, 0x9f, 0xf9};