Long long ago, there was a swordsman. One day he went to the ferry to get across a river. While the ferry boat was crossing the river, the swordsman’s sword dropped into the water. The swordsman was not a bit worried, he stopped and composedly draw a mark on the boat where the sword was lost. The boat man was very curious and asked the swordsman, “Why don’t you get the sword back?” “Don’t worry. I’ve marked the place at which it dropped. I can get it back after we arrive.” Answered proudly the swordsman.