80491
Specially designed basis-exchange pivoting algorithms , such as Lemke 's algorithm and a variant of the simplex algorithm of Dantzig have been used for decades .
 Lemke, Dantzig
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lemke, Dantzig