Excuse me, what is the meaning of "three bones" in "two blessings, four virtues and five studies in one's life"

Three bones: once the fortune teller pointed to a child and said to a local teacher, "I counted his horoscope, and I have been miserable all my life!" " "With the pride of fortune telling, the local teacher said," Life is bitter, but you can rebuild a bone. "So the fortune teller and Mr. Feng Shui made a 20-year agreement. After 20 years, this child will eventually become a great achievement. All feng shui masters know this story and can look it up.