In battle, use the direct forces to match the enemy, and use the indirect forces to win the enemy. Thus, the person who is adept at using indirect forces, can use it in such infinite ways like the ever-changing forces and elements of nature and the ceaseless flow of water in rivers and streams. Chapter Five, Sun Tzu Art of War

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In the first sentence, Sun Tzu mentioned to use direct force to match the enemy and using indirect force to win the enemy. And in the next few…