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J.J.K ( Janus ) Ooms ( 15 Augustus 1866 , Amsterdam – 6 November 1924 , Amsterdam ) was a Dutch rower who was the first non-Briton to win the Diamond Challenge Sculls at Henley Royal Regatta .
 Janus, Ooms, Amsterdam, Amsterdam, Henley Royal Regatta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Janus, Ooms, Amsterdam, Amsterdam, Henley Royal Regatta