367516
While initially the idea of ordering two similar but technically different series of ships for the same purpose was to gain operational experience for the future arctic freighters , shortly after the deal was made public the shipyards approached Sudoimport to agree on a uniform design , resulting in a class of sub-arctic 15,000 DWT cargo ships , the SA-15 class .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None