Can you describe how Sai Baba sourced the materials for the Dhuni and what the process of giving Udi signified for departing devotees in Chapter 33?

As described in Chapter 33, Sai Baba sourced fuel for the sacred Dhuni by buying surplus firewood bundles and collecting offerings. These dry logs were then offered into the fire. The resulting sacred ash, or Udi, was meticulously collected. For devotees asking for permission to return to their villages, the act of receiving Udi from Baba held a special significance. The text clearly states that when Baba said, 'Take the Udi,' it was understood as the true and final permission to leave. This practice was known to all devotees and filled them with encouragement and a sense of being blessed for their journey.