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Since I was twelve years old, I have been practicing day and night with a bamboo stick in hand, but I don't know what the sword is? When he reaches the age of eighteen, he holds a sharp sword in his hand and its edge is exposed, so he knows that the sword is a murderous weapon. When I was twenty-two years ago, I held a hidden-edged sword in my hand and could injure the enemy without relying on the edge. I felt the profoundness of the sword for the first time! ... At the age of forty, he understands the principles of swordsmanship and masters its meaning. He seems to have reached the pinnacle of swordsmanship. Looking at the blue sky, the sky is invisible, and the sword's intention is also invisible. If I use my full strength, can I break it with one sword?