Provincial and metropolitan exams were organized in three sessions. The first session consisted of three questions on the examinee's interpretation of the Four Books, and four on the Classics corpus. The second session took place three days later, and consisted of a discursive essay, five critical judgments, and one in the style of an edict, an announcement and a memorial. Three days after that, the third session was held, consisting of five essays on the Classics, historiography, and contemporary affairs. The palace exam was just one session, consisting of questions on critical matters in the Classics or current affairs. Written answers were expected to follow a predefined structure called the eight-legged essay which consisted of the eight parts opening, amplification, preliminary exposition, initial argument, central argument, latter argument, final argument, and conclusion. The length of the essay ranged between 550 and 700 characters. Gu Yanwu considered the eight-legged essay to be worse than the book burning of Qin Shi Huang and his burying alive of 460 Confucian scholars.