47046
Although the primary characters are Moominmamma and Moomintroll , most of the principal characters of later stories were only introduced in the next book , so " The Moomins and the Great Flood " is frequently considered a forerunner to the main series .
 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