204580
The Reverend William Rutter Dawes conducted his noted investigations of double stars at the observatory from 1839 to 1844 ; John Russell Hind began his career there in October of the following year .
 person: William Rutter Dawes; person: John Russell Hind
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: William Rutter Dawes, John Russell Hind 
Answer:
 person: William Rutter Dawes; person: John Russell Hind