244380
The referendum was the third on the subject ; the first in 1952 had seen the state convert to a presidential system , whilst a second in 1953 reversed the decision and saw the monarchy restored in 1954 .
 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