51465
In a two-stroke engine , the four " cycles " of internal combustion engine theory ( intake , compression , ignition , exhaust ) occur in one revolution , while in a four-stroke engine it occurs in two complete revolutions .
 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