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Unsupported Edit

There is an unsubstantiated edit by 71.236.6.189, dating from July 1, 2012. It has no known reference and yet is very detailed in its description. Does this ""editing contribution"" to Wikipedia stay or go, since it is seemingly conjecture at its best? The user has never returned to Wikipedia, so it doesn't appear that anyone can ask them about it or its source...   "