I want to know the answer to the following question:
What years did the Tsangpa start and end?
All the background I'm provided with is that "Helmut Hoffman states that the Ming upheld the facade of rule over Tibet through periodic missions of "tribute emissaries" to the Ming court and by granting nominal titles to ruling lamas, but did not actually interfere in Tibetan governance.". Is that enough to answer the question?
Answer: no