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The foci of a triangle 's Steiner inellipse can be found as follows , according to Marden 's theorem : Denote the triangle 's vertices in the complex plane as , , and .
 Steiner, Marden
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Steiner, Marden