191027
A ' Circular arc hull is the by engineer Fredrik Ljungstrom constructed hull who successfully used his sailboat designs , commonly called Ljungstrom sailboat .
 Fredrik Ljungstrom, Ljungstrom
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fredrik Ljungstrom, Ljungstrom