10550
They were discovered before the convention that extrasolar planets receive designations consisting of the star 's name followed by lower-case Roman letters starting from " b " , in order of discovery , was established .
 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