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Due to the simplicity of the design ( two intersecting lines ) , cross-shaped incisions make their appearance from deep prehistory ; as cults in European Upper Paleolithic caves , dating back to the beginning of the Iron Age , and throughout prehistory to the crux gammata .
 European Upper Paleolithic, Iron Age
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 European Upper Paleolithic, Iron Age