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Gustave Eiffel agreed to take on the project , provided he could build on a rock foundation , if found at a depth of less than below the ice .
 person: Gustave Eiffel
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Gustave Eiffel