조예
In late 238, Cao Rui became seriously ill, and he wanted to appoint Cao Yu, Xiahou Xian (夏侯獻), Cao Shuang, Cao Zhao (曹肇) and Qin Lang to help him administer state affairs in his absence. Xiahou Xian and others had disagreements with the ministers Liu Fang (劉放) and Sun Zi (孫資), so Liu Fang and Sun Zi managed to persuade Cao Rui to change his decision. Cao Rui then appointed Cao Shuang and Sima Yi as the regents instead, while Qin Lang and the others were dismissed from office.