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This work is copyrighted (or assumed to be copyrighted) and unlicensed. It does not fall into one of the blanket acceptable non-free content categories or Non-free content, and it is not covered by a more specific non-free content license. However, it is believed that the use of this work: to illustrate the subject in question, where no free equivalent is available or could be created that would adequately give the same information, qualifies as fair use under United States copyright law.