The copyright holder of this work allows anyone to use it for any purpose including unrestricted redistribution, commercial use, and modification.Copyrighted free useCopyrighted free usefalsefalse
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This work has been released into the public domain by its author, 3dball. This applies worldwide.
In some countries this may not be legally possible; if so: 3dball grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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The original description page was here. All following user names refer to zh.wikipedia.