1942
Over the next few years Soul corresponding with the aging Thomas Clarkson keeping him informed on the progress of measures to abolish slavery completely .
 person: Soul; person: Thomas Clarkson
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Soul; person: Thomas Clarkson