190614
Donald A. Gillies , however , argued the ban is , in effect , the same as Karl Popper 's measure of the severity of a test .
 Donald A. Gillies, Karl Popper 's
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Donald A. Gillies, Karl Popper 's