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ソースは？
自分はエリアに入れるのが数人でも問題ないと考えている　以下去年11月のAMA

Just like with the definition of private residential property, this guideline hasn’t changed. These locations would still be eligible, including restricted areas on the grounds of a company’s headquarters or behind locked gates so long as there wouldn’t be objections to you entering the area and the location is accessible to some folks.