四书

四书	Sì shū	Four Books, namely: the Great Learning 大学, the Doctrine of the Mean 中庸, the Analects of Confucius 论语, and Mencius 孟子
四	sì	four / 4
书	Shū	abbr. for 书经
书	shū	book / letter / document / CL:本,册,部 / to write