5: strategic military power
what enable the masses of the "Three Armies" invariably to withstand the enemy without being defeated are the unorthodox (ch'i) and the orthodox (cheng)
if wherever the army attacks, it is like a whetstone thrown against an egg, it is due to a vacuous and the substancial
In general, in batter one engages with the orthodox and gains victory through the unorthodox, thus, one who excels in sending forth the unorthodox is as inexhaustible as heaven, and as unlimited as the Yangtze and Yellow rivers.