3238
In dimension 2 ( i.e. surfaces ) , the mapping class group is a finitely presented group generated by Dehn twists ( Dehn , Lickorish , Hatcher ) .
 person: Dehn; person: Dehn; person: Lickorish; person: Hatcher
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: Dehn; person: Dehn; person: Lickorish; person: Hatcher