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Priwall was a four-masted steel - hulled barque with royal sails over double top and topgallant sail s. The windjammer was ordered by the F. Laeisz shipping company of Hamburg and launched at the Blohm & Voss yard , Hamburg , on 23 June 1917 .
 Hamburg, Blohm & Voss, Hamburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hamburg, Blohm & Voss, Hamburg