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It was not until the 18th century however , and the invention of the steam engine , that a practical means of delivering effective power to a marine screw propulsion system became available , but initial attempts to build such a vessel met with failure .
 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