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[We now come to one of the most interesting parts of Sun Tzŭ's

treatise, the discussion of the cheng and the ch'i." As it is by

no means easy to grasp the full significance of these two terms,

or to render them consistently by good English equivalents; it

may be as well to tabulate some of the commentators' remarks on

the subject before proceeding further. Li Ch'uan: "Facing the

enemy is cheng, making lateral diversion is ch'i.