Piece - 3 One
This is an interestingly ambiguous query! "3 one piece" could refer to a few different things. Here are the most likely interpretations, along with a notable paper (or concept) for each. You might be looking for an academic or analytical paper about a specific "Rule of Three" in One Piece (e.g., the Three Great Powers, the three types of Haki, the Monster Trio (Luffy, Zoro, Sanji), or the three ancient weapons).
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