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In 1970 he took his first studio at SPACE , St. Katherine 's dock , London , an artists ' initiative set up by Bridget Riley and Peter Sedgley .
 London, Bridget Riley, Sedgley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 London, Bridget Riley, Sedgley