380302
The plant was built on three underground levels : the first is a mezzanine access which also serves as the underpass to cross the square , and consists of a walkway at the perimeter balcony overlooking the lower floor , open .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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