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We have omitted Zhou's famous Taiji Tu because including all of the special symbols was deemed too time-consuming. We may remedy this lack in the future. (Added in 2005: here is the Taijitu.) Note that we have included the extremely influential Taiji Tu Shuo. We have also omitted the few poems and inscriptions by Zhou that are included in the text, as well as numerous prefaces written in the Song through Qing dynasties that are collected in appendices. These decisions have been made in an attempt to get the most out of currently available student resources; if such resources become less scarce (or more readily compensated!) in the future, we hope to remedy these omissions.