I want to know the answer to the following question:
Where did Hou Xian and Zhi Guang travel through on their way to the Karmapa?
All the background I'm provided with is that "Traveling to Lhasa either through Qinghai or via the Silk Road to Khotan, Hou Xian and Zhi Guang did not return to Nanjing until 1407.". Is that enough to answer the question?