What specific methods did Sai Baba use to help his devotees realize the 'Nirguna' or formless reality, as described in Chapter 11?

Chapter 11 details several methods Sai Baba employed to guide his devotees from devotion to his physical form towards an understanding of the formless 'Nirguna' reality. According to the chapter, Baba used countless means tailored to each devotee's eligibility. These methods were sometimes challenging and designed to create a sense of longing. For instance, he would send one devotee to another country, confine another to solitude within Shirdi, lock a person in the Wada, or assign them the continuous task of reading scriptures. The purpose of these practices, as described in Chapter 11, was to ensure that whether sitting, sleeping, or eating, the devotee's mind would remain constantly occupied with Baba's company, thereby transitioning their focus from the physical to the eternal.