 In his comments on the Xici I:9 (preserved by Han Kangbo [332–380]), Wang Bi explains this intricate relationship between part and whole. Originally a passage about divination, Xici I:9 begins with a discussion of selecting a hexagram by counting 50 yarrow stalks. Known as “the number of Great Expansion” (dayan zhishu), the selection includes a step wherein the diviner separates the 50 yarrow stalks into two piles: (a) a group of 49 stalks that will be used to select a hexagram, and (b) an unused stalk that will be set aside in the rest of the divination procedure (for a translation of this passage, see WB: 310–315). Wang Bi views the group of 49 stalks as you (Being) and the unused stalk as wu (Non-Being). He said,