《史记·七十列传·龟策列传》
如果我求的不能得到，请向我呈现弯折不直的兆文，中心和边缘兆文不相对应，首足不现兆文。 
不得，发乡我身挫折，中外不相应，首足灭去。 
If that which I am about to divine about is not to be obtained, let there be a crooked stem, that does not meet in the middle, nor on the outer side, and let there be no head nor feet.