A knife is usually diagnosed as a pointy and pointed slicing device with a unmarried aspect and from time to time a sharpened swedge. A dagger is also a knife, but is characterized by using having both aspects sharpened and a slim point perfect for stabbing. once a knife or dagger becomes longer than can almost be used with a single hand, or is made particularly for struggle, it becomes a sword.
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What is the difference between a knife and a dagger and a sword?
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See:
https://katanaswords.net/samurai-swords/