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One of the first native British architects to design in a modernist style , he made numerous contacts with leading European architects while contributing to the Architects Journal in the 1930s , and in 1933 was secretary and founder member of the MARS Group .
 MARS Group
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 MARS Group