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Another Dutchman identified by K. Schippers in his study of the movement in the Netherlands was the Groningen typographer H. N. Werkman , who was in touch with van Doesburg and Schwitters while editing his own magazine , " The Next Call " ( 1923 – 6 ) .
 K. Schippers, Netherlands, Groningen, H. N. Werkman, van Doesburg, Schwitters
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 K. Schippers, Netherlands, Groningen, H. N. Werkman, van Doesburg, Schwitters