Concept
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The Pyramids of the Old Kingdom
Step Pyramid at Saqqara
Djoser's step pyramid was the first of the great pyramids built during the Old Kingdom in Eqypt. Unlike later pyramids, it used a step design that is easily recognized.
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"Saqqara1 Djoser's step pyramid."
http://commons.wikimedia.org/wiki/File:Saqqara1_Djoser's_step_pyramid.jpg
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