What is the primary story used to illustrate the power of Udi in Chapter 34 of the Shri Sai Satcharitra?

Chapter 34 of the Shri Sai Satcharitra continues the narration on the glory of Udi by telling the story of a doctor from Malegaon. His nephew was afflicted with a severe bone-cyst, described as Hadyavran, which proved incurable by all available medical treatments. As detailed in this chapter, numerous physicians, expert surgeons, and both native and foreign remedies failed to provide any relief. After exhausting all options, the family heard of the great saint Sai Baba of Shirdi. They traveled to meet him, and upon their plea, Sai Baba gave them Udi to smear on the wound, reassuring them of a complete cure. This story serves as the chapter's main illustration of Udi's miraculous healing properties.