Chapter 20, "Yao Yue", particularly the first verse, is bizarre in terms of both language and content. In terms of language, the text appears to be archaic (or a deliberate imitation of the archaic language of the Western Zhou) and bears some similarity with the language of the speeches in the "Shujing". In terms of the content, the passage appears to be an admonition by Yao to Shun on the eve of Yao's abdication, which seems to be only tangentially related to Confucius and his philosophy. Moreover, there appear to be some problems with the text's continuity, and scholars have speculated that parts of the text were lost in the process of transmission and possibly transmitted with errors in the order. The fragmentary nature of the final chapter of the received Lu text has been explained by the "accretion theory", in which the text of the "Analects" was gradually accreted over a 230-year period, beginning with the death of Confucius and ending suddenly with the conquest of Lu in 249 BCE.