Allen Chou says to YSITD
隨便舉例 a = {"type":"parser","url":"https://google.com/example","lineNumber":221} b = {"type":"parser","url":"https://google.com/example","lineNumber":241} c = {"type":"parser","url":"https://google.com/example","lineNumber":261} distance(a, b) = distance(b, c) = distance(a, c)